Regulation of Blood Flow Flashcards Preview

Biology > Regulation of Blood Flow > Flashcards

Flashcards in Regulation of Blood Flow Deck (19):
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

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
- Reduces ability to transport blood

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