GCSE WJEC Biology: Mind Map for Rapid Recall | GCSE WJEC 生物：思维导图速记

📚 GCSE WJEC Biology: Mind Map for Rapid Recall | GCSE WJEC 生物：思维导图速记

Mind maps are a powerful revision tool for GCSE WJEC Biology, helping you link key concepts, structures, and processes in a clear visual format. This article organises the entire WJEC Biology specification into ten major topics, each broken down into bite-sized points. Read the English explanations first, then reinforce your understanding with the matching Chinese paragraph.

思维导图是 GCSE WJEC 生物复习的强大工具，能够以清晰的视觉形式将关键概念、结构与过程关联起来。这篇文章将 WJEC 生物考纲整理为十个主要主题，每个主题再分解为易于记忆的要点。先阅读英文解释，再用对应的中文段落加深理解。

1. Cell Structure and Function | 细胞结构与功能

Both animal and plant cells share common organelles: a cell membrane controls what enters and leaves; cytoplasm is where most chemical reactions occur; a nucleus contains DNA; mitochondria carry out aerobic respiration; and ribosomes synthesise proteins. Plant cells also have a rigid cell wall made of cellulose, a large permanent vacuole filled with cell sap, and chloroplasts that absorb light for photosynthesis.

动物细胞和植物细胞都有共同的细胞器：细胞膜控制物质进出；细胞质是大多数化学反应的发生场所；细胞核含有 DNA；线粒体进行有氧呼吸；核糖体合成蛋白质。植物细胞还拥有由纤维素构成的坚韧细胞壁、充满细胞液的大液泡，以及吸收光能进行光合作用的叶绿体。

Specialised cells are adapted to perform specific functions. For example, a sperm cell has a tail to swim and many mitochondria to provide energy; a nerve cell is long and has branched endings to transmit impulses; a root hair cell has a long extension to increase surface area for water absorption; and a red blood cell has a biconcave shape and no nucleus to maximise oxygen carriage.

特化细胞经过适应来执行特定功能。例如，精子细胞具有用于游动的尾巴和大量提供能量的线粒体；神经细胞很长且末端分支以传递神经冲动；根毛细胞具有长突起以增大吸收水分的表面积；红血球呈双凹圆盘状且无细胞核，以便最大限度携带氧气。

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2. Cell Division and Stem Cells | 细胞分裂与干细胞

Mitosis produces two genetically identical daughter cells for growth and repair. Before division, DNA replicates so each chromosome consists of two chromatids. Chromosomes line up at the equator, then chromatids are pulled apart to opposite poles by spindle fibres. Finally, the cytoplasm divides, forming two new cells with the same number of chromosomes as the parent cell.

有丝分裂产生两个遗传上相同的子细胞，用于生长与修复。在分裂前，DNA 复制使得每条染色体由两条染色单体组成。染色体排列在赤道板上，然后纺锤丝将染色单体拉向细胞两极。最后细胞质分裂，形成两个新细胞，其染色体数目与母细胞相同。

Stem cells are undifferentiated cells that can divide to produce more stem cells or differentiate into specialised cells. Embryonic stem cells can become any cell type, offering huge medical potential, while adult stem cells are limited to repairing specific tissues. In plants, meristems contain stem cells that enable lifelong growth.

干细胞是未分化的细胞，能够分裂产生更多干细胞或分化成特化细胞。胚胎干细胞可以分化成任何细胞类型，具有巨大的医学潜力；成体干细胞则局限于修复特定组织。在植物中，分生组织含有干细胞，使植物能够持续生长。

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3. Organisation: Digestive System and Enzymes | 组织层级：消化系统与酶

The digestive system breaks down large insoluble molecules into small soluble ones that can be absorbed into the blood. Food travels from the mouth, down the oesophagus, into the stomach, then to the small intestine where most digestion and absorption happen, and finally the large intestine reabsorbs water before egestion.

消化系统将大分子不溶性物质分解为可溶于水的小分子，以便被吸收进入血液。食物从口腔向下经食道进入胃，再进入大部分消化和吸收发生的小肠，最后大肠重吸收水分后排出残渣。

Enzymes are biological catalysts that speed up reactions; each enzyme has an active site with a shape complementary to its substrate, like a lock and key. Amylase breaks down starch into maltose, protease breaks proteins into amino acids, and lipase breaks lipids into fatty acids and glycerol. Enzymes work best at specific temperatures and pH levels; extremes cause denaturation.

酶是生物催化剂，能加快反应速率；每种酶的活性部位形状与底物互补，就像锁和钥匙。淀粉酶将淀粉分解为麦芽糖，蛋白酶将蛋白质分解为氨基酸，脂肪酶将脂质分解为脂肪酸和甘油。酶在最适温度及 pH 下活性最高；极端条件会导致变性。

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4. The Circulatory System and Blood | 循环系统与血液

The human circulatory system is a double circulation: the right side pumps deoxygenated blood to the lungs, while the left side pumps oxygenated blood to the rest of the body. The heart has four chambers – two atria and two ventricles – and valves prevent backflow. Coronary arteries supply the heart muscle with oxygen and nutrients.

人体循环系统为双循环：右心将缺氧血泵向肺部，左心将富氧血泵向全身。心脏有四个腔室——两个心房和两个心室——瓣膜防止血液倒流。冠状动脉为心肌供应氧气和营养物质。

Arteries carry blood away from the heart under high pressure; they have thick, elastic, muscular walls. Veins return blood to the heart at low pressure and contain valves. Capillaries are one-cell thick to allow efficient exchange of substances. Blood consists of plasma, red blood cells (transport oxygen), white blood cells (defence), and platelets (clotting).

动脉将血液在高压下带离心脏，其管壁厚实且有弹性及肌肉层。静脉在低压下将血液送回心脏，并含有瓣膜。毛细血管仅有一层细胞厚，利于高效的物质交换。血液由血浆、红血球（运输氧气）、白血球（防御）和血小板（凝血）组成。

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5. The Respiratory System and Gas Exchange | 呼吸系统与气体交换

Air enters through the trachea, branches into bronchi, then bronchioles, and finally reaches alveoli. Alveoli are tiny air sacs surrounded by capillaries, providing a large surface area, thin walls, and a rich blood supply for efficient gas exchange. Oxygen diffuses into the blood while carbon dioxide diffuses out.

空气经气管进入，分支到支气管，再进入细支气管，最后到达肺泡。肺泡是被毛细血管包围的微小气囊，提供了巨大的表面积、极薄的壁和丰富的血液供应以进行高效气体交换。氧气扩散进入血液，二氧化碳则扩散出去。

Aerobic respiration releases energy from glucose using oxygen: glucose + oxygen → carbon dioxide + water (+ energy). The balanced symbol equation is: C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O. Anaerobic respiration in muscles produces lactic acid and less energy; in yeast and plants it produces ethanol and carbon dioxide.

有氧呼吸利用氧气从葡萄糖中释放能量：葡萄糖 + 氧气 → 二氧化碳 + 水（+ 能量）。配平的符号方程为：C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O。肌肉中的无氧呼吸产生乳酸和较少的能量；酵母和植物中的无氧呼吸则产生乙醇和二氧化碳。

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6. Nervous System and Hormonal Control | 神经系统与激素控制

The nervous system uses electrical impulses for rapid, short-lived responses. A reflex arc is the simplest pathway: a receptor detects a stimulus, a sensory neuron carries the impulse to the CNS, a relay neuron connects, and a motor neuron sends the impulse to an effector (muscle or gland). Synapses use neurotransmitters to transmit signals between neurons.

神经系统利用电脉冲产生快速而短暂的反应。反射弧是最简单的通路：感受器检测刺激，感觉神经元将冲动传入中枢神经系统，中间神经元进行连接，运动神经元将冲动传出至效应器（肌肉或腺体）。突触利用神经递质在神经元之间传递信号。

Hormones are chemical messengers transported in the blood, producing slower but longer-lasting effects. Insulin lowers blood glucose by making cells take up glucose and converting it to glycogen, while glucagon raises blood glucose by converting glycogen back to glucose. This negative feedback maintains homeostasis.

激素是通过血液运输的化学信使，产生较慢但持久的作用。胰岛素通过促使细胞摄取葡萄糖并将其转化为糖原来降低血糖，而胰高血糖素通过将糖原转化回葡萄糖来升高血糖。这种负反馈机制维持体内稳态。

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7. Homeostasis and the Kidneys | 稳态与肾脏

Homeostasis maintains a stable internal environment by regulating temperature, water content, and blood glucose. The thermoregulatory centre in the brain coordinates responses such as sweating, shivering, and changing blood flow to the skin.

稳态通过调节体温、水含量和血糖来维持稳定的内环境。大脑中的体温调节中枢协调如出汗、发抖和改变皮肤血流等反应。

The kidneys filter blood in millions of nephrons. High-pressure filtration in the glomerulus produces a filtrate; useful substances like glucose, some ions, and water are selectively reabsorbed along the tubule. The hormone ADH increases water reabsorption when the blood is too concentrated. Urine containing urea and excess water is excreted.

肾脏通过数百万个肾单位过滤血液。肾小球中的高压过滤产生滤液；葡萄糖、部分离子和水等有用物质沿肾小管被选择性重吸收。当血液过浓时，激素 ADH 增加水的重吸收。含有尿素和多余水分的尿液被排出体外。

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8. Plant Transport and Photosynthesis | 植物运输与光合作用

Xylem vessels transport water and mineral ions from roots to the leaves. The movement is driven by transpiration, where water evaporates from leaf surfaces, creating a tension that pulls water up the stem. Phloem transports dissolved sugars (translocation) from sources to sinks.

木质部导管将水和无机盐由根部运输到叶片。蒸腾作用驱动这一运输：水分从叶片表面蒸发，产生拉力将水向上拉。韧皮部则将溶解的糖类（有机物转运）从源头运输到库。

Photosynthesis uses light energy to convert carbon dioxide and water into glucose and oxygen: 6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂. The rate of photosynthesis is limited by light intensity, carbon dioxide concentration, and temperature. Farmers use

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