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