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Applied Physiology > Systems of energy delivery > Flashcards

Systems of energy delivery Flashcards

1
Q

what constitutes greatest upset to homeostasis of body?

A

exercise

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2
Q

Fx of CVS?

A

integrate body as unit
provide muscles with O2 and nutrients
Remove byproducts of metabolism

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3
Q

What regulates HR and internal opening of blood vessels?

A

neurochemical factors

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4
Q

What is the intrinsic and extrinsic control of heart?

A

intrinsic: SA node
Extrinsic: ANS

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5
Q

Atria receives _____ fibers while ventricles receive

A

sympathetic and parasympathetic fibers

mostly sympathetic fibers

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6
Q

Which patients will have ANS Dysfunction?

why is this important?

A

DM,MS,RA

need to take HR because it might not rise with exercise

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7
Q

What is the sympathetic influence on the heart?

A

stimulation releases catecholamines that accelerate SA node depol

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8
Q

What is Chronotropic effect?

Inotropic effect?

A

Heart beats faster

Heart beats stronger.

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9
Q

What is parasympathetic influence on the heart?

A

Release Act to slow HR.

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10
Q

What is the cause of initial HR rise during Exercise?

A

PNS inhibition (not SNS stimulation)

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11
Q

The magnitude of HR increase during exercise relates directly to what?

A

physical activity intensity and duration

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12
Q

What provides greatest control over heart during exercise?

A

Central command

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13
Q

% of O2 used by heart vs muscles at rest?

A

70-80%

20%

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14
Q

What does heart utilize as a fuel source at rest, mod exercise, and vigorous exercise?

A

Fats

mod: Carbs

Vigorous: Lactic Acid

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15
Q

What are factors affecting Cardiac Output

A 
Preload
Afterload
Contractility
HR
Synergy of Contraction
Distensibility of Ventricle
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16
Q

How much pressure the heart has to work against

A

Afterload

17
Q

What will increase metabolic load the most?

A

HR

18
Q

Maximum capacity for the aerobic resynthesis of ATP

formula?

A

VO2 max

=a-vO2diff x Q

19
Q

Amount of blood pumped by heart in one minute

aka what? formula

A

Q

Cardiac output= HRxSV

20
Q

Amount of blood pumped by the L ventricle per beat.

Formula

A

Stroke Volume

EDV-ESV

21
Q

The difference between O2 content of arterial and mixed venous blood.

O2 extracted by muscles

A

a-v O2 diff

22
Q

Resistance of peripheral circulation?

formula

A

TPR

= BP/Q

23
Q

Force exerted by blood on arterial Wall?

formula

A

BP

=TPRxQ

24
Q

Amount of blood left in L ventricle after diastole?

Systole?

A

EDV

ESV

25
Q

Percentage of blood that is ejected during SV?

formula?

A

Ejection Fraction

=SV/EDV

26
Q

Average blood pressure?

formula?

A

MAP

DBP+ [.333(SBP-DBP)]

Applied Physiology (11 decks)

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