CORONARY CIRCULATION
Blood supply during exercise is increased in:
| A |
Cutaneous circulation |
|
| B |
Hepato-splanchnic circulation |
|
| C |
Renal circulation |
|
| D |
Coronary circulation |
Blood supply during exercise is increased in:
| A |
Cutaneous circulation |
|
| B |
Hepato-splanchnic circulation |
|
| C |
Renal circulation |
|
| D |
Coronary circulation |
D i.e Coronary circulation
During exercise blood is shunted from regions that do not require immediate support to areas with increased demands. (e.g. skeletal muscles, heart.)
|
|
Quiet standing |
Exercise |
Effect |
|
Cardiac output ml/min |
5900 |
24,000 |
/IV |
|
Blood flow to: |
|||
|
Active skeletal muscle |
650 |
20,850 |
’11’ |
|
Heart |
250 |
1000 |
DIe |
|
Brain |
750 |
750 |
Unchanged |
|
Skin |
500 |
500 |
Unchanged |
|
Inactive skeletal muscle |
650 |
300 |
.1, |
|
Kidney, Liver, GIT ect. |
3100 |
600 |
.1.tQ |
Sympathetic stimulation increases blood flow except:
| A |
Skin |
|
| B |
Coronary circulation |
|
| C |
Cerebral |
|
| D |
Renal |
Sympathetic stimulation increases blood flow except:
| A |
Skin |
|
| B |
Coronary circulation |
|
| C |
Cerebral |
|
| D |
Renal |
Ans. a. Skin
Sympathetic stimulation decreases blood flow in skin.
Sympathetic Stimulation
- Stimulation of sympathetic fibers causes vasoconstriction but it is not important, as the vasocontricor system is not well developed in cerebral vascular bed.
- Sympathetic stimulation increases myocardial blood flow through an increased metabolic demand and a predominance of beta-receptor activation.
