Exercise pt 1 Flashcards Preview

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Flashcards in Exercise pt 1 Deck (10):
1

What are the changes in BF during exercise?

Active skeletal muscle and heart muscle
Brain
Skin
GIT, kidneys and other organs

2

Active skeletal muscle and heart muscle

Increased BF
Locally controlled arteriolar vasodilation (active hyperaemia)
Reinforced by epinephrine in these tissues

3

Brains

Blood flow increases by 25-30%

4

Skin

BF Increase with prolonged exercise
Hypothalamic temperature control = skin Arterioles vasodilatory
Heat generated by skeletal muscle is lost to the environment
Norepinephrine - a1 receptors - generalised vasoconstriction
Epinephrine - a1 and b2 receptors
Activation of b2 receptors causes vasodilation

5

GIT, kidneys and other organs

BF decreases
Sympathetically induced arteriolar vasoconstriction Via a1 receptors

6

What are the proposed causes of increased ventilation?

Proprioception
Increased body temperature
Adrenaline
Cerebral cortex

7

Proprioception

Afferent impulses sent to chemoreceptors
Joint and muscle receptors stimulated during exercise

8

Increased body temperature

Stimulate RCC
Body temperature rises during exercise

9

Adrenaline

Cause an increase in sympathetic activity - increase in epinephrine
Adrenal medullary hormone stimulate RCC to increase ventilation

10

Cerebral cortex

Feed-forward regulatory mechanism
Motor region of brain increases ventilation and circulation