1What is the main function of the circulatory system?
Transport substances around the body
2What are the two main circuits of the circulatory system?
Pulmonary and systemic circuits
3What do arteries do?
Carry blood away from the heart
4What do veins do?
Carry blood back to the heart
5What do capillaries do?
Exchange substances with body tissues
6What is the role of the capillaries?
Substance exchange (oxygen, glucose)
7What is tissue fluid?
Fluid surrounding cells, from blood plasma
8Where is tissue fluid formed?
At the capillary bed
9What happens at the capillary bed?
Blood pressure forces fluid into tissue
10How does blood pressure change at the capillary bed?
It decreases as blood enters
11What is the difference between arteries and veins?
Arteries carry blood away, veins carry blood to the heart
12What is the role of arteries in circulation?
Transport blood under high pressure
13What is the role of veins in circulation?
Transport blood under low pressure
14Why do veins have thinner walls than arteries?
To accommodate lower pressure
15Why do arteries have thicker walls than veins?
To withstand high pressure
16What do veins contain to help blood flow?
Valves to prevent backflow
17What is the structure of capillaries?
Thin walls for efficient diffusion
18What does hydrostatic pressure cause in capillaries?
Fluid to move into tissue
19What helps prevent excess fluid build-up in tissues?
Lymphatic system
20What does the lymphatic system do?
Drains excess fluid and returns it to blood
21What is the function of the blood's tissue fluid?
Carry oxygen, nutrients, and waste
22What happens to tissue fluid after it leaves the capillaries?
It returns to the circulatory system
23What feature of arteries helps their function?
Thick muscular walls for pressure
24What feature of veins helps their function?
Valves to prevent backflow