which hold cardiac muscle fibers together 19. Intercalated discs contain a. Sarc
ID: 3505793 • Letter: W
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which hold cardiac muscle fibers together 19. Intercalated discs contain a. Sarcolemma c. Gap junctions d. Nuclei 20. An absolute refractory period is the... a. Amount of time an action potential lasts b Interval of time in which another action potential cannot be triggered c. Closing of voltage gated channels during the repolarization phase d. Rapid polarization after threshold is reached during an action potential 21. What does the QRS complex represent on an EKG? a. Atrial depolarization b. Ventricular depolarization c. Ventricular repolarization d. The amount of time the ventricular fibers are depolarized 22. Which of the following is true about heart sounds? a. $1 in called the lubb sound b. S2 is called the dubb (dupp) sound c. $4 is always pathological d. All of the above 23. Which of the following is true about cardiac output? a. It is the amount of blood ejected by the left ventricle into the aorta each minute b. Itis the amount of blood ejected by the right ventride into the pulmonary trunk each minute c It is equal to the stroke volume multiplied by the heart rate d. All of the above 24. An individual with a slower resting rate... a. Will typically have smaller resting stroke volumes due to b. Will typically have smaller resting strake volumes due to increased filling time c Will typically have larger resting stroke volumes due to decreased filling time picall have larger resting stroke volumes due to increased filling timeExplanation / Answer
19.Intercalated discs contain Gap junction which hold cardiac muscle fibres together.
Explanation:Cardiac muscle fibers contain a single nucleus which are brunched. and this fibre join one another by intercalated disc that contain gap junction which create depolarization between cells and desmosomes to hold the fibers togethers when heart contract.
20. An absolute refractory period is the interval of time in which another action potential can not be triggered.
Explanation: this absolute refractory period of time during which a second action potential absolutely can not be initiated.the period from the initiation of the first action potential to immediately after the peak.this is the time during which another stimulus given to the neuron no matter how strong stimulus it is will not lead to the second action potential.
21.Ans:Ventricular depolarization.
Explanation:The first wave is the P wave, which represents the depolarization of the atria.This occur when right before the atria push the blood into the ventrical. The next wave is called QRS wave. and it represents the depolarization of ventrical. it is much larger than the P wave.
22:ANS: All of the above.
Explanation:The main normal heart sounds are the S1 or lubb , Second sound or S2 or dubb. S3 can be normal or pathologic. But A S4 heart sound is almost always pathologic.
23:ANS: All of the above.
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