Blood Pressure, Heart Rate, Blood Flow, Etc Flashcards Preview

My NBCE Part 1 - Cardiovascular Physiology > Blood Pressure, Heart Rate, Blood Flow, Etc > Flashcards

Flashcards in Blood Pressure, Heart Rate, Blood Flow, Etc Deck (39)
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1

Sympathetic control of heart is between which vertebral levels?

T1-T4/5

2

What sympathetic ganglia control heart rate?

Middle and inferior cervical

3

Sympathetic does what in the heart?

Increases rate of contraction, speed of conduction, and force of contraction

4

Increase speed on conduction aka?

+ dromotropism

5

Increase speed of contraction aka?

+ chronotropism

6

Increase force of contraction aka?

+ inotropism

7

How is the parasympathetic control of heart done?

Via vague nerve cardiac branches

8

What happens to hear under parasympathetic control?

Decreased rate of contraction, speed of conduction, and force of contraction.

9

Sympathetic and parasympathetic control increases/decreases HR by increasing/decreasing which phase?

Phase 4

10

Sympathetic and parasympathetic control increases/decreases conduction velocity by increasing/decreasing what?

PR interval

11

Sympathetic and parasympathetic control increases/decreases force of contraction by increasing/decreasing what in which phase?

Ca++ influx
Phase 2

12

Blood pressure =

CO X peripheral resistance

13

CO is the product of what?

Stroke Volume X HR

14

CO = 70 ml X 70 beats/min = what?

5 liters/min

15

Blood pressure may be affected by what three things?

HR
Peripheral resistance
Stroke volume

16

What are two mechanisms of BP control. Which is fast and which is slow? Why?

baroreceptors - fast - neurotransmitter
renin-angiotensin-aldosterone - slow - hormonal dependent

17

Where are baroreceptor located?

Carotid sinus and aortic arch

18

Baroreceptor sense what?

High pressure

19

Baroreceptor relay info via what? To where?

Afferent in CN IX and X
medulla

20

A drop in BP will cause heart rate to do what?

increase

21

An rise in BP will cause heart rate to do what?

decrease

22

The reflex response to a rise or drop in BP is via what?

autonomic nervous system

23

Where are low pressure baroreceptor located?

SVC, IVC, and right atrium monitors

24

Poiselle's Law: Peripheral resistance (PR) is directly proportional to what?

Viscosity of blood and length of vessel

25

Poiselle's Law: PR is inversely proportional to what?

Radius of vessel to the 4th power

26

If blood vessel radius decreases by half then ...

Resistance increases by a factor of 16

27

The greatest resistance in the vascular system is offered by what?

arterioles

28

What law states that pressure within a blood vessel is related the tension, size, and shape of the vessel?

La Place's Law

29

La Place's law governs what?

Blood flow through a tubular structure

30

Blood flow is _______ proportional to the diameter of the blood vessel.

inversely