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Describe the following for skeletal, smooth, and cardiac myocytes. A. Excitation-contraction coupling B. How the electrical signal gets to each cell C. Pacemaker cells D. Repolarization (not relaxation)

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Collen Von
Collen VonLv2
28 Sep 2019
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Related questions

there are 4 stages in muscle contraction: excitation, excitation-contraction coupling, contraction, and relaxation.
a) briefly describe the molecular process of excitation, beginning at the synaptic bulb of the neuron. how does this affect the muscle fiber?
b) how is calcium released from the sarcoplasmic reticulum during excitation-contraction coupling, and how do troponin and tropomyosin regulate the interaction between myosin and actin
c) describe the events of one cross-bridge cycle and how this shortens the sarcomere.
d) following contraction, what events must occur to allow the muscle to relax?

29) Excitation-contraction coupling in skeletal muscle involvesALL of the following events except one. Which one is NOTinvolved?

A) ATP hydrolysis

B) Binding of Ca2+ to calmodulin

C) Depolarization of the sarcolemma

D) Cross-bridge cycling

30) Malignant hyperthermia is a potentially fatal geneticdisorder characterized by a hyperresponsiveness to anesthetics,which results in elevated body temperature, and skeletal musclecontractions. Which of the following could account for theseclinical manifestations?

A) Inhibition of the ryanodine receptor (RYR) channels

B) Prolonged opening of the ryanodine receptor (RYR)channels

C) Enhanced activity of the sarcoplasmic reticulum Ca2+ ATPase(SERCA)

D) Reduction in the density of voltage-gated Na+ channels in theT-tubule membrane

31) Administration of which of the following would reverse theeffects of a non-depolarizing muscle blocker on the neuromuscularjunction?

A) Na+ channel blocker

B) Acetylcholine receptor antagonist

C) Reversible acetylcholinesterase inhibitor

D) Inhibitor of excitation-contraction coupling

1. What is the significance of the ST segment?

a. ventricular depolarization

b. ventricular systole

c. atrial systole

d. atrial depolarization

2. Ventricular contraction is also known as ventricular __________.

3. Ventricular diastole is also known as ventricular __________.

4.

A nurse takes your blood pressure and tells you the numbers are 110/70. What are your blood pressures?

rev: 11_20_2014_QC_55932

a. Systolic = 110 mmHg, Diastolic = 70 mmHg

b. Diastolic = 110 mmHg, Systolic = 70 mmHg

5.

The brachial artery is the most common site of blood pressure measurement with the sphygmomanometer.

True

False

6.

Cardiac cycle is the ____________________________.

a. The volume of blood ejected by each ventricle in one minute

b. One complete contraction and relaxation of all chambers of the heart

c. The pressure blood exerts on the wall of blood vessels

d. Depolarization and repolarization of the ventricles

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