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Flashcards in Cardiovascular System Deck (35)
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1

What does the cardiovascular system do?

Circulate and transport nutrients, oxygen, carbon dioxide, hormones and blood cells to and from the cells of the body
Fights disease, stabilises temperature, ph and helps maintain homeostasis

2

What are the three essential components of the cardiovascular system?

Heart, blood and blood vessels

3

What is the pulmonary circulation?

a loop through the lungs where blood is oxygenated

4

What is the systemic circulation?

a loop through the rest of the body to provide oxygenated blood and receive deoxygenated blood

5

What is a closed circulatory system?

Blood never leaves the vessels

6

How much blood does an average adult have?

5 litres

7

How many litres of blood is red blood cells and plasma?

Red blood cells- 2 litres
Plasma- 3 litres

8

Where is most of your blood at any given time?

Veins

9

What is bridging?

compression of a segment of coronary artery during systole, causing narrowing that reverses during diastole

10

What is an end artery?

Terminal artery supplying all or most of the blood to a body part without significant collateral circulation
e.g. coronary artery, splenic artery, cerebral arteries and renal arteries and absolute- retina

11

What is collateral circulation?

branches of artery are used to supply blood

12

What occurs in systole?

Left ventricle contraction causes the blood pressure in the aorta to rise and the walls if the elastic arts stretch

13

What occurs in diastole?

Aortic semi-lunar valves close, and the walls of the aorta recoil, maintaining pressure in the blood and moving it towards the heart and smaller vessels, aortic pressure drops

14

What do elastic arteries act as?

pressure reservoirs

15

What are the three layers of an artery and vein wall?

Tunica intima (inside), tunica media, tunica adventitia (outside)

16

What is an Aneurysm?

A dilation of a blood vessel

17

What is the tunica intima made out of?

Endothelium

18

What is the tunica media made out of?

Smooth muscle

19

What s the Tunica adventitia made out of?

Fibroelastin connective tissue

20

What are arterioles?

Arteries with a diameter of less than 0.1mm

21

What are Metarterioles?

Artie that supply blood to capillary beds

22

What is a precapillary sphincter?

Allow the articles and metarterioles to serve as flow regulators for the capillary bed

23

If precapillary sphincters are open what occurs?

plentiful blood flow through the capillary bed

24

What occurs to arterioles during exercise?

Blood flow to skeletal muscle is increased by dilation of arterioles and blood flow to intestine is decreased by constriction of arterioles

25

How much of our total blood volume do capillaries hold?

5%

26

What happens in capillaries?

Gas and nutrient exchange

27

What is a capillary made from?

single layer of endothelium and basement membrane

28

What is a pericyte?

Form a branching network on the outer surface of the endothelium, can differentiate into muscle cells and fibroblasts

29

What is a post capillary venule?

receive blood from capillary- more permeable, fluid drains into them due to low pressure

30

What is a valve?

A venule made of thin extensions