PULMONARY CIRCUIT DURING EXERCISE Flashcards Preview

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Flashcards in PULMONARY CIRCUIT DURING EXERCISE Deck (18):
1

PULMONARY CIRCUIT

- during exercise

2

blood flow (CO)

- LARGE INCREASE

3

pulmonary arterial pressure

- SLIGHT INCREASE
- mostly NORMAL

4

pulmonary vascular resistance

- LARGE DECREASE
- flow is inverse to resistance

5

pulmonary blood volume

- INCREASE
- due to increase in CO

6

number of perfused capillaries

- INCREASE
- for better exchange in the lung
- increase Oxygenation

7

capillary surface area

- INCREASE, which means INCREASED rate of gas exchange

8

smoker

- pulmonary hypertension
- increase lung marking in the X-ray

9

systemic circuit ARTERIAL SYSTEM

- PO2 NO CHANGE, fully saturated
- PCO2 no change, increase ventilation proportional to increase metabolism
- pH no change, or decrease due to production of lactic acid, extreme exercise decrease pH due excessive production of lactic acid causing muscle cramps extracellular to intracellular, electrolyte shift
- MAP slight increase
- body temp. slight increase
- blood flow LARGE INCREASE
- vascular resistance (TPR) LARGE DECREASE due to release of lactic acid, due to dilation of skeletal muscle beds

10

systemic circuit VENOUS SYSTEM

- PO2 DECREASE, due to increase extraction
- PCO2 INCREASE, due to metabolism

11

during exercise

- INCREASE SYSTOLIC PRESSURE
- DECREASE DIASTOLIC PRESSURE
= MEAN PRESSURE SAME

12

exercising muscle

- blood flow INCREASE
- vascular resistance DECREASE due to release in lactic acid
- capillary pressure INCREASE due to increase in flow
- capillary filtration INCREASE, due to increase hydrostatic pressure
- lymph flow INCREASE
- venous PO2 DECREASE and can reach extremely LOW levels
- extraction of oxygen INCREASE

13

Cutaneous blood flow

- initially DECREASE, then INCREASE to dissipate heat

14

Coronary blood flow

- INCREASE due to INCREASE IN VOLUME WORK of the heart
- due to increase in ADENOSINE

15

cerebral blood flow

- no change due to unchanged arterial CO2

16

renal blood flow

- decrease in the splanchnic circuit

17

heart

- increase volume work
- increase HR, increase metabolism, increase production of ADENOSINE, causing increase in coronary flow
- preload normal in light and moderate exercise
- preload increase in heavy exercise

18

regular exercise

- increase maximal O2 consumption
- increase ability to deliver O2 to active muscle by increasing CO
- increase coronary flow, increase adenosine
- low HR but > SV
- increase SV 35%
- HR normal same as untrained individuals
- increases # of arterioles, w/c decreases minimal resistance during exercise
- increase capillary density, w/c increases surface area and decreases diffusion distance
- increase # of oxidative enzymes in the mitochondria due to INCREASE IN ELECTRON TRANSPORT CHAIN, increase metabolism causing weight control