Question 3In the Sino-Atrial Node which is not true?O A. Shows spontaneous (oscillatory) electrical behavior.B. Has a calcium mediated action potential upstroke.C. Has a stable resting membrane potentialD. Has no inward rectifier potassium current.O E. Has an additional inward current that turns on during diastolic depolarization.

The SA node, which is commonly known as the pacemaker is a half-moon-like cluster of myocytes…

Answered: In the Sino-Atrial Node which is not…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Endothelium in the arterioles does not A. Release nitric oxide to relax contraction. OB. Sense stress due to fluid flow and/or pressure in the arteriole OC Face the lumen of the arteriole. D. Contract to reduce the capillary diameter. O E. All of the above are true.
A 28-year-old athlete is noted to have a baseline heart rate of 55bpm, which his trainer attributes to excellent parasympathetic (vagal) tone. This parasympathetic effect normally increases Ach release at the SA and AV nodes. Ach release into AV node leads to which of the following effects of its fibers? a. increased action potential amplitudeb. increased conduction velocityc. increased K+ equilibrium potentiald. Hyperpolarizatione. increased rate of depolarization of the pacemaker potential
Cardiac output is: A. The volume of blood pumped over a period of time. B. The stroke volume times the peripheral resistance. OC. Governed by the Nernst equation. D. All of the above. O E. None of the above.
Which portion of the ECG corresponds torepolarization of the atria?a. P waveb. QRS complexc. T waved. none of the above: atrial repolarization is maskedby ventricular depolarization
9
Which action potential phase is paired CORRECTLY with when it happens during the EKG? A. Action potential B, phase 0 = T wave B. Action potential A, phase 0 = QRS complex C. Action potential A, phase 3 = S-wave D. Action potential B, phase 0 = PQ interval E. Action potential A, phase 4 = ST segment
During atrial fibrillation: A. The EKG shows an exaggerated P wave. B. There is a noticeable increase in the regularity of beating. OC. The ventricle undergoes reentrant refractoriness. OD. None of the above. OE. All of the above.
1. In ventricular fibrillation, there is no pattern visible in the EKG. What does this mean in terms of contraction? A. contraction will have no visible pattern either and the ventricles will be unable to eject much blood B. the pattern doesn't matter; contraction of the ventricles will not be affected as long as ventricular myocytes continue to depolarize and depolarize C. the ventricular myocytes will be unable to contract C. contraction will become constant and ventricles will be unable to fill with blood 2. Which structure follows depolarization of the SA Node and atria in the cardiac conduction system? A.ventricular myocytes B.AV Node C.left and right bundle branches D.AV bundle E Purkinje fibers 3. Hypertension increases afterload for the heart which in turn A. increases Stroke Volume B. decreases Stroke Volume C.increases Cardiac Output D.increases Venous Return
4. This is not and will not be graded
An electrocardiogram (ECG) measures the ____. A difference in electrical potential between two points on the body B force produced by the ventricles as they contract C cardiac output D amount of blood the ventricles eject in a single beat E membrane potential at which voltage-gated channels will open
When the blood pressure is high, how will the myogenic reflex help to bring the blood pressure baack to normal? (circle all that apply)a. Calcium channels on smooth muscle opensb. Potassium channels open helping potassium to rush into the cellc. Vasoconstriction take placed. Stretch receptors in the afferent arterioles are activated e. Vasodilation take place
When we flung our arms around on the first day of class our heart rate increased to meet the demands of our exercising muscles. What was the mechanism by which this occurred? O Norepinephrine bound to receptors on the SA and AV nodes of the heart O The excess CO2 in the plasma generated by our skeletal muscles directly stimulated our cardiomyocytes to contract more frequently O Parasympathetic postganglionic neurons released acetylcholine onto the SA and AV nodes of the heart

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