Regulation of Blood Flow Flashcards Preview

Biology > Regulation of Blood Flow > Flashcards

Flashcards in Regulation of Blood Flow Deck (20):
1

Cardiac Output

-Amount of blood flowing from the heart each minute
- Affected by stroke volume and heart rate
- stroke volume x heart rate

2

Stroke Volume

- Quantity of blood pumped with each heart beat
- weaker=more beats

3

Heart rate

-beats per minute (normal, 70)

4

Blood Pressure

- Measure of force that blood pushes against the arteries
- depends on Cardiac output and Arteriolar resistance

5

Increased cardiac output=?

increased pressure

6

Contraction of smooth muscle =

increased BP

7

Relaxation of smooth muscle =?

decreased BP

8

BP measured with ______

sphygmomanometer (BP cuff)

9

Systolic BP

ventricular contraction

normal = 120mmHg

10

Diastolic BP

Ventricular relaxation

Normal = 70mmHg

11

Hypertension

- high BP
- causes blood vessels to weaken or rupture
- connective tissue builds up bcs of body repairing itself, making arteries hard and less elastic
-140/90
- Cause chest pains, strokes, heart attacks

12

Regulating High BP

BP receptors > medulla oblongata > arteries dilate > increase of outflow from artery > cardiac output decreases > slows movement of blood into arteries > lowers BP

13

Hypotension

- Low BP
- 90/60
- Reduces ability to transport blood
- Cause heart attacks, shock, stroke

14

Regulating Low BP

- BP receptors > medulla oblongata > arteries constrict > increase blood flow into artery > cardiac output increased > decreased outflow of blood > increases BP

15

Regulating Body Temperature

Thermoregulation: maintenance of body temperature within a range that allows cells to function efficiently

16

Temperature rises Pathway

1. Nerve impulse > hypothalamus
2. stimulated sweat glands
3. Dilated blood vessels
4. Blood flow to skin increases
5. Heat loss (sweating)

17

Temperature drops pathway

1. Nerve impulse > hypothalamus
2. Skeletal muscles contract > shiver
3. Blood vessels constrict
4. Reduced heat loss

18

Filtration

- Water moves from capillary > ECF (Extracellular Fluid)

19

Absorption

Water moves from ECF > capillary

20

What is the effect of loss of blood

Cause low BP which increases the heart rate, the heart will beat faster to help the blood loss, blood vessels constrict to increase blood flow into artery