cvs regulation

Question 1

CO x TPR

Answer 1

BP

Question 2

SV x HR

Answer 2

CO

Question 3

quantity of blood pumped by heart per minute

Answer 3

CO

Question 4

volume of blood ejected with each heart beat

Answer 4

SV

Question 5

inhibits automaticity

Answer 5

PNS

Question 6

Ach activates Kach channels in cardiac cells –> open kach channels –>

Answer 6

SA AV node with cholinesterase –> decay quickly

Question 7

enzyme that destroy Ach

Answer 7

cholinesterase

Question 8

Ach released quickly activates special Ach-regulated K+ channels –>

Answer 8

brief latency –> rapid decay of response

Question 9

rapid decay of response –>

Answer 9

beat by beat control of SA and AV nodal function

Question 10

enhances automaticity

gradual decay of response

Answer 10

SNS

Question 11

site: aortic arch, carotid sinuses

Answer 11

baroreceptor reflex

Question 12

> 100-180 mmHg –>

Answer 12

increase PNS, minimal SNS

Question 13

< 100-180 mmHg –>

Answer 13

increase SNS, absent PNS

Question 14

increase blood volume –> increase HR

Answer 14

Bainbridge reflex

Question 15

increase blood volume –>

Answer 15

bainbridge reflex

Question 16

decrease blood volume –>

Answer 16

baroreceptor reflex

Question 17

increase SNS –> increase HR

Answer 17

inspiration

Question 18

increase PNS –> decrease HR

Answer 18

expiration

Question 19

exaggerated when vagal tone is increased

Answer 19

Sinus Arrhythmia

Question 20

stimulus peripheral chemoreceptors

Answer 20

hypoxia
hypercapnea
acidosis

Question 21

peripheral chemoreceptors –> stimulation medullary vagal centers –>

Answer 21

decrease HR

Question 22

stimulate endocardial receptors of ventricle –>

Answer 22

dec HR

dec TPR

Question 23

ANS: SNS –?

Answer 23

increase HR

Question 24

PNS –?

Answer 24

decrease HR

Question 25

higher centers

Answer 25

increase HR

Question 26

Baroreceptor reflex: increase BP --?

Answer 26

decrease HR

Question 27

baroreceptor reflex: decrease BP --?

Answer 27

increase HR

Question 28

bainbridge: increase blood volume --?

Answer 28

increase HR

Question 29

inspiration --?

Answer 29

increase HR

Question 30

expiration --?

Answer 30

decrease HR

Question 31

chemoreceptor reflex: | PC02 P02

Answer 31

decrease HR

Question 32

invoked in response to changes in resting length of myocardial fibers

Answer 32

frank-starling mechanism

Question 33

increase ventricular contraction -->

Answer 33

greater stroke volume

Question 34

increase in fiber length alters cardiac performance by

Answer 34

altering number of myofilament crossbridges

Question 35

increase ventricular volume -->

Answer 35

increase cardiac fiber length

Question 36

optimal fiber length --> increase filling pressure -->

Answer 36

overstretch fibers --> LV dysfunction

Question 37

decrease contraction interval --> increase contractile force -->

Answer 37

increase Ca++

Question 38

sino mahal mo???

Answer 38

si lllooooyyyyddddd