Exam 3 lecture 22 Flashcards

(15 cards)

1
Q

Murmur

A

Abnormal heart sounds of blood flowing the wrong way

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2
Q

Systole

A

Chamber contracts

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3
Q

Diastole

A

Chamber relaxes

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4
Q

Stroke volume

A

Volume pumped in 1 cardiac contraction

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5
Q

Cardiac output

A

Volume pumped in 1 minute

SV * HR

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6
Q

Heart rate, tachycardia, bradycardia

A

60-100bpm

> 100 bpm

< 60 bpm

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7
Q

Contraction steps

A
  1. A and V diastole
  2. A systole, V diastole
  3. V systole, A diastole
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8
Q

Cardiac muscle contraction

A

-Similar to skeletal muscle contraction
-Electrically excitable

Neurogenic: nervous system tells to contract
Myogenic: Stimulus comes from heart itself

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9
Q

Intrinsic conduction system

A

-Autohythmic cells (pacemaker cells) generate electrical signal (A.P)

-Depolarization: more +
-Repolarization: back to -
Threshold: amount of change in M.P before signal can be sent

-Slow depolarization: pacemaker potential, allows for heart to control HR on its own

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10
Q

Slow depolarization action potential graph

A

-not flat, slow and gradual increase
-Small # of Na going into cells

-More Na, faster heart rate

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11
Q

SA node (sinoatrial)

AV node (atrioventricular)

A

-Pacemaker

-Backup pacemaker

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12
Q

Bundle of his

Bundle branches

A

-Carries signal down septum

-Takes signal to left and right

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13
Q

Purkinje fibers

A

-Sends signal to muscle to contract

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14
Q

EKG

A

-Records only electrical activity

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15
Q

Extrinsic regulation of cardiac output

A

-ANS modifies cardiac output

-Parasympathetic NS (rest): HR down, SV down

-Sympathetic NS (fight): HR up, SV up

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