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Grade 9 November Exams > Life Science- Life Science > Flashcards

Flashcards in Life Science- Life Science Deck (15):
1

Function

Transport gases, nutrients, wastes and hormones

2

Atrioventricular valves

Between atria and ventricles.
Bicuspid (mitral) under left atrium
Tricuspid under right atrium
When valves are open blood drains from atria into ventricles.
When ventricles contract, valve flaps are forced shit, blocking blood from re-entering atria.

3

Semilunar valves

Located in arteries leaving ventricles
Pulmonic valve at base of pulmonary artery
Aortic valve at base of aorta
When ventricles contract, valves are forced open and let blood flow.
When ventricles relax, back flow of blood fills flaps of valves and forces them shut.

4

Blood vessels

Arteries carry blood away from heart
Veins carry blood to heart
Capillaries connect arteries to veins and exchange gases with tissues

5

Arteries

High pressure
Very thick, stretchy walls that expand in size
Most carry oxygenated blood
Damaged arteries spurt in time to heart beat

6

Aorta

Largest vessel
Receives blood from left ventricle

7

Arteriales

Smaller vessels connecting arteries to capillaries

8

Veins

Low pressure
Have valves to prevent back flow of blood against gravity.
Most carry de-oxygenated blood
Damaged veins ooze blood

9

Vena cava

Dump all blood from body into right atrium
Superior- receives blood from upper body
Inferior- receives blood from lower body

10

Venules

Smaller vessels connecting veins to capillaries

11

Capillaries

Connect arteries and veins
Walls are one cell thick
Allow for exchange of gases through thin walls(drop off oxygen delivered from heart by arteries and pick up carbon dioxide and send it to the heart through veins)

12

Coronary arteries

Exit aorta and supply oxygen or blood to heart muscle (myocardium)

13

Coronary veins

Pick up and return deoxygenated blood from myocardium

14

Vein bursts

And causes bruising

15

Hard blow to

Chest will upset the rhythm of heart

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