Study Notes
The transport system in humans involves the movement of substances like blood, gases, and waste products through various systems. Blood is a connective tissue that transports oxygen and nutrients to cells and removes waste. The gas exchange system involves the exchange of gases in the lungs, while the excretory system removes waste from the body.
- Blood — a red fluid that transports oxygen and nutrients to cells and removes waste. Example: Blood consists of plasma and blood corpuscles.
- Red Blood Cells (RBCs) — biconcave cells that carry oxygen using haemoglobin. Example: RBCs form in red bone marrow and have a lifespan of about four months.
- White Blood Cells (WBCs) — larger cells that protect the body from infections. Example: WBCs destroy infectious particles through phagocytosis.
- Platelets — cell fragments that help in blood clotting. Example: Platelets contain thromboplastin and have a lifespan of 5-7 days.
- Plasma — the liquid component of blood, mostly water, containing nutrients and waste. Example: Plasma makes up about 92% water.
- Gas Exchange System — involves the exchange of gases in the lungs through alveoli. Example: Alveoli have thin walls and a large surface area for efficient gas exchange.
- Human Excretory System — removes waste from the body through the kidneys and urinary tract. Example: Urine is formed in the kidneys and stored in the bladder before excretion.
Exam Tips
Key Definitions to Remember
- Blood
- Red Blood Cells
- White Blood Cells
- Platelets
- Plasma
- Gas Exchange System
- Human Excretory System
Common Confusions
- Confusing the roles of RBCs and WBCs
- Misunderstanding the process of gas exchange in alveoli
- Mixing up the components of blood
Typical Exam Questions
- What is the function of red blood cells? Red blood cells carry oxygen using haemoglobin.
- How does gas exchange occur in the lungs? Gas exchange occurs by diffusion in the alveoli.
- What is the role of the excretory system? The excretory system removes waste from the body.
What Examiners Usually Test
- Understanding of blood components and their functions
- The process of gas exchange in the respiratory system
- The pathway and function of the human excretory system