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Bio 141 Cardiac
Cardiac
27
Biology
Undergraduate 1
06/04/2017

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Term
Intercalated Discs
Definition

Collection of Proteins that connect Cardiac muscles at branch points:

Desmosomes

Gap Junctions

Term
Desmosomes
Definition
Type of Incalated disc that physically connects the tissue together and allows muscles to pull against each other without damaging membrane
Term
Gap Junctions
Definition
Type of Incalated disc that allows for calcium and other ions to move through and inbetween cells allowing muscle cells to excite each other.
Term
Atria
Definition
Top chambers of the heart that are thin muscled and pump to the ventricle
Term
Ventricle
Definition
Bottom chambers of the heart with thick muscle walls and pump blood to the lungs and body
Term
Vena Cava
Definition
Consist of a superior and inferior, brings back deoxygenated blood to the heart, specifically the right atrium
Term
Aorta
Definition
Transports oxygenated blood from the heart to the rest of the body
Term
SA Node
Definition

Sinoatrial node

 Pacemaker start of the action potential for the contraction of the heart cell, SA node then leads to the AV Node and the Bachmann Bundle, excited 100-80x p/min

Term
AV Node
Definition
Artrioventricular Node, continues the action potential down to the AV bundle or Bundle of His. excited 80-60x p/m
Term
Atrioventricular Bundle
Definition
Continues the Action Potential to the Purkinje Fibers 60-40x p/m
Term
Purkinje Fibers
Definition
Fibers that surrond all the other parts of the heart allowing it to contract. 40-20x p/m
Term
Cardiomyocotes
Definition
striated, contract, branched, can excite neighbors and be excited
Term
Conductive Cells
Definition
Initiate and facilitate the flow of the Action potential for heart beat
Term
Quiescent
Definition
The Resting Membrane Potential of the heart in which pressure is high outside of the heart, and low inside of the heart, local potential period, blood fills ventricle and then up to atrium
Term
isovolumetic contraction
Definition
ventricles contract due to the action potential but the blood stays within ventricles, closes av nodes and contracts from bottom up,
Term
isovolumetric relaxation
Definition
repolarization of heart
Term
ventricular ejection
Definition
ventricles push blood into the lungs and aorta due to action potential reaching perkinje fibers, end systolic volume
Term
First Heart sound
Definition
AV nodes close
Term
Second Heart sound
Definition
Semirlunar nodes-- aorta and pulmanary nodes close
Term
systole
Definition
contraction
Term
diastole
Definition
relaxation
Term
end diastolic volume
Definition
blood that is forced from atrials to ventricles atrial systole
Term
end systolic volume
Definition
blood that is moved from ventricles to lung and body ventricular ejection
Term
Stroke volume
Definition
amount of blood pumped each time from left ventricle
Term
cardiac output
Definition
amount of blood pumped by left ventricle in one minute HRxSV
Term
cardioaccelatory center
Definition
increases the amount of contractions of the heart
Term
cardioinhibitory center
Definition
does not stop but slows down the amount of heart contractions
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