Chapter 5 - Cardiovascular System Flashcards Preview

Biology 16 > Chapter 5 - Cardiovascular System > Flashcards

Flashcards in Chapter 5 - Cardiovascular System Deck (17):
0

Blood flow of heart

Superior vena cava > right atrium > atrioventricular valve > right ventricle > lungs > left atrium > atrioventricular valve > left ventricle > inferior vena cava > out to body

1

Pulmonary circuits

Exchange of gas.
Circulates blood through the lungs

2

Systemic circuits

Serves the needs of body tissues. Include all veins and arteries.

3

High blood pressure - hypertension

When blood moves through the arteries at a higher pressure then normal.

Present when systolic blood pressure is 140 or greater, or the diastolic blood pressure is 90 or greater.

4

Arterioles

Are small arteries barely visible to the naked eye.

5

Capillary

An extremely narrow, microscopic tube with a wall composed only of endothelium.

6

Venules

Are small veins that drain blood from capillaries and then join to form a vein

7

Atrium

The two upper, thin walled - right and left atrium

8

Ventricles

The two lower thicker chambers - left and right ventricles.

9

Atrioventricular valves

Valves that lies between the atria and ventricles

10

Semilunar valves

Valves that are flaps shaped like half moons

11

Coronary circulation

Myocardium receives oxygen and nutrients from the coronary arteries - wastes are removed by the cardiac veins.

12

Systole

The working phase - contractions of the chambers

13

Diastole

Resting phase - relaxation of the chambers

14

Sinoatrial node (SA node)

Located in upper dorsal wall of right atrium

Initiates the heartbeat and automatically sends out an excitation signal every .85 second. - causes atria to contract

15

Atrioventricular node (AV node)

Base of right atrium near the septum

Slight delay when av node is reached - ventricles begin contraction after atria finishes.

16

Electrocardiogram (ECG)

A recording of the electrical changes that occur in the myocardium during a cardiac cycle.