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19thomasar
31.05.2021 •
Biology
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Skeletal muscle can reach tetanus whereas cardiac muscle cannot because...
Group of answer choices
skeletal muscle depolarizes with sodium, wheras cardiac muscle requires calcium
cardiac muscle runs out of ATP more quickly than skeletal muscle
skeletal muscle has more stamina than cardiac muscle
skeletal muscle AP's have short refractory periods whereas cardiac muscle AP's have long refractory periods
What is the location and function of the NCX pumps?
Group of answer choices
SR of contractile cells; pump calcium back into SR
intercalated disks; pump calcium into cell and sodium out of cell
t-tubules and sarcolemma of contractile cells, pump calcium out to ECF
sarcolemma of autorhythmic cells; open calcium channels for depolarization
Which of the answer choices has the correct sequence of structures for blood flow through the heart & body one time?
(Structures may be missing in the sequence choices, but you can still figure out the correct sequence.)
Group of answer choices
vena cavae, pulmonary valve, pulmonary veins, lungs
lungs, left ventricle, pulmonary arteries, right atrium
aortic valve, tricuspid valve, right ventricle, vena cavae
right ventricle, bicuspid valve, aorta, right atrium
During the isovolumic (AKA isovolumetric) relaxation period, the pressure in the ventricles is and the AV valves are .
Group of answer choices
increasing; closed
decreasing; closed
constant; open
constant: closed
decreasing; open
Which two waves are coupled together in an ECG, given a consistent pattern on the ECG?
Group of answer choices
P and T
QRS and T
P and QRS
The autonomic nervous system can influence heart rate . The mechanism for changing heart rate is by .
Group of answer choices
sympathetic decrease of potassium current or parasympathetic decrease of sodium current.
sympathetic decrease of sodium current or parasympathetic decrease of potassium current.
sympathetic increase of potassium current or parasympathetic decrease of sodium current.
sympathetic increase of sodium current or parasympathetic increase of potassium current.
True/False: Your stroke volume would increase if sympathetic output increased on the veins of your body.
Group of answer choices
True
False
AND.. Muscle mass usually reflects the relative strength of the muscle. Which chamber in the heart has the thickest walls & the most muscle mass?
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