The Heart and Blood Flashcards Preview

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Flashcards in The Heart and Blood Deck (22):
1

4 components of blood

plasma, erythrocytes, leucocytes

2

Function of plasma

transports heat and dissolved substances eg. vitamins, CO2, hormones, minerals

3

Function of red blood cells

transports O2

4

Function of lymphocytes

make antibodies

5

Function of Monocytes/ Macrophages

scavenge and digest bacteria.

6

Function of phagocytes

engulf bacteria after surrounding them and digest them.

7

Function of thrombocytes

clot blood

8

Arteries

-thick walls
small lumen
-high pressure blood
-no valves
-oxygenated except pulmonary artery
-flows in pulses

9

Veins

-thin walls
-large lumen
-dexygenated blood except in pulmonary vein
-doesn't flow in pulses
-has valves
-blood is at lower pressure.

10

Blood pressure

the force the blood exerts against the walls of the blood vessel. mmHg

11

Pulse

the alternating expansion and contraction of the arteries.

12

Where is the heart?`

between the two lungs, slightly to the left of your thorax, above the diaphragm.

13

What holds bicuspid valves in position?

heartstrings

14

Function of semilunar valves

allows blood flow out of the heart through pulmonary artery/ aorta and prevents blood from going back into the heart.

15

Function of pericardial fluid

helps reduce friction .

16

Atria

thin walls as blood only needs to go a short distance.

17

Ventricles

thicker wall as they pump blood for longer and for a further distance.

18

Benefits of double circulation

-oxygen rich blood and oxygen poor blood are separate
-ensures b.p. is high enough to get blood everywhere
(single circuit can only have blood at low pressure. This restricts the metabolism of the animal)

19

Pulmonary circuit

-right ventricle pumps blood around here
-blood gains O2 and loses CO2 at lungs.
-short circuit, walls are thin

20

Systemic Circuit

-Left ventricle pumps blood to head/ shoulders/ legs etc.
-lose O2 and gain CO2
-longer route, thicker walls.

21

What is a portal system?

blood pathway that begins and ends in capillaries.

22

Hepatic portal vein

connects stomach and intestines to the liver.