📚 Year 7 AQA Biology: Full Syllabus Overview | Year 7 AQA 生物：课程大纲全面解析
Year 7 AQA Biology introduces students to the fascinating world of living organisms, laying a solid foundation for Key Stage 3 science and future GCSE studies. This syllabus covers the fundamental principles of life, from the microscopic building blocks of cells to the complex interactions within ecosystems, and explores essential human body systems. Through a combination of theoretical learning and practical investigations, students develop scientific curiosity and an understanding of how biology connects to everyday life and the natural world.
Year 7 AQA 生物课程引领学生进入迷人的生物世界，为第三关键阶段科学及未来的 GCSE 学习奠定坚实基础。该课程大纲涵盖了从微小的细胞基本结构到生态系统中复杂的相互作用等一系列生命基础原理，并探索重要的人体系统。通过理论学习与实践探究相结合，学生将培养科学好奇心，理解生物学如何与日常生活及自然界紧密相连。
1. Cells: The Building Blocks of Life | 细胞：生命的基本单位
All living organisms are made up of cells, which are the smallest units of life capable of carrying out all life processes. Some organisms, such as bacteria and protozoa, are unicellular (single-celled), while most plants and animals are multicellular. To view cells, scientists use light microscopes, which magnify structures that are otherwise invisible to the naked eye.
所有生物都由细胞构成，细胞是能够完成一切生命活动的最小生命单位。有些生物，如细菌和原生动物，是单细胞的，而大多数植物和动物则是多细胞的。为了观察细胞，科学家使用光学显微镜，将肉眼不可见的结构放大。
Plant and animal cells share several common organelles: the nucleus controls the cell's activities and contains genetic material; cytoplasm is a jelly-like substance where chemical reactions occur; the cell membrane controls what enters and leaves the cell; and mitochondria are the sites of respiration, releasing energy. However, plant cells have three additional structures that animal cells lack. A rigid cell wall made of cellulose provides support and shape. Chloroplasts contain chlorophyll and absorb light energy for photosynthesis. A large permanent vacuole filled with cell sap helps maintain the cell's turgor pressure.
植物细胞和动物细胞共有许多细胞器：细胞核控制细胞活动并包含遗传物质；细胞质是发生化学反应的胶状物质；细胞膜控制物质进出细胞；线粒体是呼吸作用的场所，释放能量。然而，植物细胞还有三种动物细胞没有的结构。由纤维素构成的坚韧细胞壁提供支持和保持形状。叶绿体含有叶绿素，吸收光能用于光合作用。一个含有细胞液的大液泡有助于维持细胞的膨压。
Cells can become specialised to perform specific functions. For example, a root hair cell has a long projection to increase surface area for water absorption; a red blood cell has a biconcave shape and no nucleus to maximise oxygen carriage; a nerve cell is elongated with branched endings to transmit electrical signals; and a sperm cell possesses a tail for swimming and many mitochondria for energy.
细胞可以特化以执行特定功能。例如，根毛细胞有长长的突起以增加吸收水分的表面积；红细胞呈双凹圆盘状且无细胞核，可最大限度携带氧气；神经细胞细长并带有分支末梢，用来传递电信号；精子细胞有一条用于游动的尾巴和许多提供能量的线粒体。
2. Levels of Organisation | 生物体的组织层次
Multicellular organisms are incredibly organised. Cells of the same type group together to form tissues. A tissue is a collection of similar cells working together to carry out a particular function. For instance, muscle tissue contracts to produce movement, and xylem tissue in plants transports water. Several tissues combine to make an organ, which has a distinct structure and job. The stomach is an organ made of muscular tissue, glandular tissue (which produces enzymes and acid), and epithelial tissue. Organs working together make up an organ system, such as the digestive system, which breaks down and absorbs food. Finally, all organ systems work together to form the complete organism.
多细胞生物具有极高的组织性。同类型的细胞聚集形成组织。组织是执行特定功能的相似细胞的集合。例如，肌肉组织通过收缩产生运动，而植物中的木质部组织运输水分。多个组织结合构成具有一定结构和功能的器官。胃是一个器官，由肌肉组织、腺体组织（产生酶和酸）以及上皮组织构成。多个器官协同工作构成器官系统，如消化系统，负责分解和吸收食物。最终，所有器官系统共同形成完整的生物体。
nism. This hierarchy allows efficient division of labour, enabling complex life processes.
这一层级顺序可以记为：细胞 → 组织 → 器官 → 器官系统 → 生物体。这种层级结构实现了高效分工，使得复杂的生命过程得以进行。
3. The Skeletal and Muscular Systems | 骨骼与肌肉系统
The human skeleton performs several vital roles. It provides a rigid framework that supports the body and gives it shape. The skeleton also protects delicate internal organs: the skull shields the brain, the ribcage safeguards the heart and lungs, and the vertebrae protect the spinal cord. Bones, together with joints, act as levers to allow movement when muscles contract. Additionally, some bones produce blood cells in their marrow and store minerals like calcium.
人体骨骼执行着多种至关重要的功能。它提供支持身体并赋予体型的刚性框架。骨骼还保护脆弱的内脏器官：头骨保护大脑，胸廓保护心脏和肺，椎骨保护脊髓。骨骼与关节一起作为杠杆，当肌肉收缩时产生运动。此外，有些骨骼在骨髓中产生血细胞并储存钙等矿物质。
Joints are locations where two or more bones meet. Movable synovial joints, such as the knee and elbow, contain cartilage to reduce friction and synovial fluid to lubricate the joint. Ligaments hold bones together while still allowing movement. Muscles are attached to bones via strong, inelastic tendons. In a pair of antagonistic muscles, as one contracts (shortens), the other relaxes (lengthens). A classic example is the biceps and triceps in the upper arm: when the biceps contracts, the arm bends at the elbow; when the triceps contracts, the arm straightens.
关节是两块或多块骨骼连接的地方。可动滑膜关节，如膝关节和肘关节，含有减少摩擦的软骨和润滑关节的滑液。韧带将骨骼连接在一起，同时允许运动。肌肉通过坚韧且无弹性的肌腱附着在骨骼上。在一对抗衡肌中，一块肌肉收缩（变短）时，另一块放松（变长）。典型的例子是上臂的肱二头肌和肱三头肌：当肱二头肌收缩时，手臂在肘部弯曲；当肱三头肌收缩时，手臂伸直。
4. Gas Exchange and Breathing | 气体交换与呼吸
Breathing and gas exchange are essential for providing oxygen to cells for respiration and removing waste carbon dioxide. The respiratory system includes the trachea, which splits into two bronchi, each leading into a lung. Inside the lungs, the bronchi divide into smaller bronchioles that end in tiny air sacs called alveoli. Each alveolus is surrounded by a network of capillaries, and this is where gas exchange occurs.
呼吸与气体交换对于为细胞提供呼吸作用所需的氧气并清除废气二氧化碳至关重要。呼吸系统包括气管，它分支为两个支气管，分别通往一侧肺脏。在肺内部，支气管分成更细的小支气管，末端是称为肺泡的微小气囊。每个肺泡都被毛细血管网包裹，气体交换就在此进行。
In the alveoli, oxygen passes from the inhaled air into the blood by diffusion, while carbon dioxide diffuses from the blood into the air to be exhaled. The alveoli have several adaptations that maximise efficiency: they are numerous, giving a huge total surface area; their walls are only one cell thick, providing a short diffusion distance; and they are moist, which helps gases dissolve before diffusing. Ventilation (the act of breathing) refreshes the air in the alveoli, maintaining steep concentration gradients.
在肺泡中，氧气通过扩散从吸入的空气进入血液，而二氧化碳则从血液扩散到空气中被呼出。肺泡具有多种提高交换效率的适应性特征：它们数量众多，具有巨大的总表面积；壁只有一层细胞厚，提供较短的扩散距离；且表面湿润，有助于气体在扩散前溶解。通气（呼吸动作）使肺泡内的空气不断更新，维持了陡峭的浓度梯度。
Breathing in (inhalation) occurs when the diaphragm contracts and flattens, and the intercostal muscles between the ribs contract, lifting the ribcage up and out. This increases the volume of the thorax, reducing pressure, so air rushes in. Breathing out (exhalation) is largely passive: the diaphragm and intercostal muscles relax, the thorax volume decreases, pressure rises, and air is pushed out.
吸气时，膈肌收缩变平，肋骨间的肋间肌收缩，将胸廓向上向外提拉。这使得胸腔容积增大，压力降低，空气便涌入。呼气基本是被动的：膈肌和肋间肌放松，胸腔容积减小，压力升高，空气被推出体外。
5. Adolescence and Puberty | 青春期与发育
Adolescence is the period of transition from childhood to adulthood, during which puberty occurs. Puberty is triggered by hormones – chemical messengers released into the blood. In boys, the hormone testosterone is produced by the testes, while in girls, oestrogen is produced by the ovaries. These hormones bring about physical and emotional changes that enable reproduction.
青春期是从儿童向成人过渡的时期，在此期间发生性成熟过程。性成熟由激素触发——即释放到血液中的化学信使。在男孩中，睾丸产生睾酮；在女孩中，卵巢产生雌激素。这些激素引起身体和情绪上的变化，使生殖成为可能。
Common changes in both sexes include growth spurts, underarm and pubic hair, and changes in body shape. Boys typically develop a deeper voice as the larynx enlarges, broader shoulders, and increased muscle mass. Girls experience breast development, widening of the hips, and the onset of menstruation. Emotional changes can include heightened feelings and an increased desire for independence.
男女两性共有的变化包括生长突增、腋毛及阴毛出现以及体型变化。男孩通常会随着喉结变大而声音变低沉、肩膀变宽、肌肉量增加。女孩则经历乳房发育、臀部变宽和月经初潮。情绪变化可能包括情感波动增强和对独立性的渴望增加。
6. Human Reproductive Systems | 人体生殖系统
The male reproductive system is designed to produce and deliver sperm. Sperm are produced in the testes, which are held outside the body in the scrotum to keep them cooler than core body temperature, an essential condition for sperm development. From each testis, sperm travel through the sperm duct to the urethra, where they are mixed with fluids from glands to form semen. The penis is the organ that delivers sperm into the female's body during sexual intercourse.
男性生殖系统的功能是产生并输送精子。精子在睾丸中产生，睾丸位于体外的阴囊中，以保持低于核心体温的温度，这是精子发育的必要条件。从每个睾丸出发，精子经过输精管到达尿道，在此处与腺体分泌的液体混合形成精液。阴茎是在性交时将精子输送进女性体内的器官。
The female reproductive system produces eggs (ova) and nurtures a developing baby. The two ovaries release mature eggs in a process called ovulation. After release, an egg moves along the oviduct (fallopian tube), where fertilisation may occur. The uterus, or womb, has a thick muscular wall and a soft lining where a fertilised egg can implant and grow. The cervix is a ring of muscle at the base of the uterus that keeps the baby in place during pregnancy, and the vagina receives sperm during intercourse and forms the birth canal.
女性生殖系统产生卵子并孕育发育中的胎儿。两个卵巢在排卵过程中释放成熟的卵子。排出后，卵子沿输卵管移动，受精即可能在此发生。子宫有着厚实的肌肉壁和柔软的内膜，受精卵可在此着床并生长。子宫颈是子宫底部的肌性环，在妊娠期将胎儿保持在原位；阴道在性交时接收精子并构成产道。
7. Fertilisation and Pregnancy | 受精与妊娠
Fertilisation is the fusion of a male gamete (sperm cell) and a female gamete (egg cell) to form a zygote. Each gamete contains half the genetic material (23 chromosomes) of a normal body cell, so the zygote restores the full set (46 chromosomes). After ejaculation, millions of sperm are deposited in the vagina, but only one may successfully penetrate the egg's membrane. Once fertilisation occurs, the membrane changes to prevent entry of other sperm.
受精是指雄性配子（精子）与雌性配子（卵子）融合形成受精卵的过程。每个配子都含有人体正常细胞一半的遗传物质（23 条染色体），因此受精卵恢复了全套染色体（46 条）。射精后，数百万精子被送入阴道，但只有一个可能成功穿透卵子的膜。受精发生后，卵膜会发生变化，阻止其他精子进入。
After fertilisation, the zygote divides repeatedly as it travels down the oviduct, forming a ball of cells called an embryo. About seven days after fertilisation, the embryo implants into the richly supplied uterus lining. The placenta then develops, linking the mother and baby via the umbilical cord. The placenta allows oxygen, glucose, amino acids and other nutrients to pass from the mother's blood to the baby's blood, and waste products like carbon dioxide and urea to pass back to the mother. The amniotic sac surrounds the embryo, filled with amniotic fluid that cushions and protects the developing fetus.
受精后，受精卵在沿输卵管移动的过程中不断分裂，形成一团细胞，称为胚胎。大约受精后七天，胚胎植入到血液供应丰富的子宫内膜中。随后，胎盘形成，通过脐带连接母亲与胎儿。胎盘使得氧气、葡萄糖、氨基酸和其他营养物质从母亲的血液进入胎儿的血液，同时使二氧化碳和尿素等废物回到母亲血液。羊膜囊包裹着胚胎，其内充满羊水，起到缓冲和保护发育中胎儿的作用。
Gestation in humans lasts about 40 weeks (9 months), during which the fetus grows and organs mature. By the end of pregnancy, the cervix dilates, and muscular contractions of the uterus push the baby out through the vagina during labour.
人类的妊娠期约持续 40 周（9 个月），在此期间胎儿生长且器官成熟。妊娠结束时，子宫颈扩张，子宫的肌肉收缩经产道将婴儿推出体外。
8. The Menstrual Cycle | 月经周期
The menstrual cycle is a recurring series of events that prepares the female body for possible pregnancy. The cycle typically lasts around 28 days, though this varies. Day 1 is marked by the start of menstruation (a period), when the uterus lining breaks down and is shed along with blood through the vagina. This lasts about 4–7 days. Following menstruation, the uterus lining gradually builds up again, becoming thick and spongy, rich in blood vessels – a preparation to receive a fertilised egg.
月经周期是一系列重复发生的事件，为女性身体可能的妊娠做好准备。周期一般持续约 28 天，但差异很大。第 1 天以月经开始为标志，此时子宫内膜崩解并与血液一起通过阴道排出。这一过程持续约 4–7 天。月经之后，子宫内膜逐渐重新增厚，变得松软且富含血管——这是为接纳受精卵做准备。
Around day 14 of the cycle, ovulation occurs: a mature egg is released from an ovary. This is the fertile window when pregnancy is most likely if sperm are present. The uterus lining remains thick for several days after ovulation. If fertilisation does not occur, hormone levels drop, the uterus lining degrades, and the cycle begins again with the next period. Hormones such as oestrogen and progesterone coordinate these changes.
大约在周期的第 14 天，排卵发生：成熟的卵子从卵巢中释放出来。这是受孕窗口期，若此时有精子存在，怀孕可能性最高。排卵后子宫内膜会保持数天厚度。如果未发生受精，激素水平下降，子宫内膜退化，下一个周期再次从月经开始。雌激素和孕激素等激素协调着这些变化。
9. Ecosystems and Food Webs | 生态系统与食物网
An ecosystem is made up of all the organisms living in a particular habitat and the physical environment they interact with. Key terms include a population (all the organisms of one species in an area), a community (populations of different species living together), and the habitat itself. Organisms in an ecosystem depend on each other for food, shelter, and reproduction, forming a complex web of interdependence.
生态系统由生活在特定栖息地的所有生物及其相互作用的物理环境组成。关键术语包括种群（某一区域内同一物种的所有个体）、群落（共同生活的不同物种的种群）以及栖息地本身。生态系统中的生物为了食物、庇护和繁殖而相互依赖，形成复杂的相互依存网络。
Energy flows through the ecosystem in food chains and food webs. Producers (mainly green plants and algae) make their own food via photosynthesis, converting light energy into chemical energy. Primary consumers eat producers, secondary consumers eat primary consumers, and so on. Decomposers, such as bacteria and fungi, break down dead matter and waste, recycling nutrients back into the soil. A food web shows how multiple food chains overlap, representing a more realistic feeding relationship.
能量通过食物链和食物网在生态系统中流动。生产者（主要是绿色植物和藻类）通过光合作用制造自身食物，将光能转化为化学能。初级消费者以生产者为食，次级消费者以初级消费者为食，依此类推。分解者，如细菌和真菌，分解死去的生物和废物，将养分循环回土壤。食物网展示了多条食物链如何相互重叠，代表了更真实的捕食关系。
Predator-prey relationships help regulate population sizes. If the prey population increases, predator numbers may rise due to more food availability, causing prey numbers to fall, then predators decline as food becomes scarce, and the cycle continues. Environmental changes, such as pollution, deforestation, or the introduction of a new species, can disrupt these delicate balances. Toxins can accumulate along food chains in a process called bioaccumulation, harming top predators.
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