Cardiomyocyte action potential 3 4 5 2 1 0.15 0.30 time (s) For our course, "regular" cardiocytes are cardiocytes that are NOT part of the SA node. Please use the word bank to complete the following statements: (choices can be used more than once, obviously) voltage-gated calcium channels voltage-gated sodium channels voltage-gated potassium channels stable not stable Unlike SA node cardiocytes, regular cardiocytes have a resting membrane potential that is Regular cardiocytes become stimulated when calcium and sodium pass fro neighboring excited cardiocytes through gap junctions (see 1). This causes to open, resulting in the regular cardiocytes to sharply depolarize (see 2). At 3, these channels close, and open, resulting in both depolarization and sarcomere contraction. Also at 3, open, causing the cell to repolarize. The opposing forces, (depolarization and repolarization) of the two channels that are open simultaneously, results in a plateau (see 4). This plateau continues until voltage-gated calcium channels close. At 5, only remains open, resulting in the cell repolarizing. Membrane potential (mV) +30 06-

Cardiomyocyte action potential 3 4 5 2 1 0.15 0.30 time (s) For our course, "regular" cardiocytes are cardiocytes that are NOT part of the SA node. Please use the word bank to complete the following statements: (choices can be used more than once, obviously) voltage-gated calcium channels voltage-gated sodium channels voltage-gated potassium channels stable not stable Unlike SA node cardiocytes, regular cardiocytes have a resting membrane potential that is Regular cardiocytes become stimulated when calcium and sodium pass fro neighboring excited cardiocytes through gap junctions (see 1). This causes to open, resulting in the regular cardiocytes to sharply depolarize (see 2). At 3, these channels close, and open, resulting in both depolarization and sarcomere contraction. Also at 3, open, causing the cell to repolarize. The opposing forces, (depolarization and repolarization) of the two channels that are open simultaneously, results in a plateau (see 4). This plateau continues until voltage-gated calcium channels close. At 5, only remains open, resulting in the cell repolarizing. Membrane potential (mV) +30 06-

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,...

See similar textbooks

Similar questions

Hypertrophic cardiomyopathy is always inherited, but the other forms may have other causes. List the 2 non genetic causes of dilated cardiomyopathy, restricted cardiomyopathy, and takotsubo (stress) cardiomyopathy? I really need help for this question
QUESTION 6 Which sequence is correct regarding the direction of blood flow through the cardiovascular system: Pulmonary vein, left atrium, left atrium, pulmonary artery Pulmonary vein, left atrium, left ventricle, aorta Pulmonary artery, aorta, left atrium, right atrium Vena cava, right atrium, aorta, right ventricle Vena cava, right atrium, pulmonary vein, right ventricle
KEY Stimulus Medullary cardiovascular control center Sensory receptor Integrating center Efferent path Effector Change in blood pressure Parasympathetic Carotid and aortic baroreceptors neurons Sympathetic neurons SA node Ventricles Veins Arterioles Copyright 2009 Pearson Education, Inc. 1. In the diagram above, describe the role of the integrating center and two of the effectors. 2. What will atherosclerosis do to the peripheral resistance? 3. What will atherosclerosis do to the heart rate
The contracting cells of the heart are a type of striated muscle that is said to work as a functional syncytium. Provide a definition for “functional syncytium” and describe important functional characteristics and cellular specializations
in the cardiac His-purkinje system , why do more polarized cells conduct electrical signals more quickly ?
Please answer fast Xena is chewing some plant to get some energy. Some of the plants where Xena lives contains a special compound able to stop the cardiac action potential generated by all cells of the myocardium. By reflecting on your understanding of the electrical activity of heart, discuss if Xena‘s ventricles can contract in the presence of this compound. In your answer, discuss the consequences of presence of this compound on the sequence of activation of the various parts of the conductive pathway of the heart. f) Explain the main steps and consequence of the baroreceptor-induced response when systemic vasoconstriction occurs. Describe the physiological benefit of the reflex action you identified.
Part A Which of the following problems would NOT be associated with thrombocytopenia, a lack of platelets in the blood? Which of the following problems would NOT be associated with thrombocytopenia, a lack of platelets in the blood? inability to form adequate clots in the CNS excessive clot formation at an injury site bleeding in the digestive tract excessive bleeding and bruising in the skin SubmitRequest Answer
Patient in renal failure develops hyperkalemia so that his extracellular [K+] increases from 4.5 mEq/L (normal) to 6.5 mEq/L. What will happen to the resisting membrane potential (RP) of his cardiac myocytes? a. it will depolarizeb. it will hyperpolarizec. there will be no change since K+ channels are freely permeabled. there will be no change since Na+ channels are closede. it will polarize
Question Identify the description with the correct vessel type - artery (A), capillary (C), or vein (V). Carry blood away from the heart Have the thickest walls Converge to form veins Have the lowest pressure Carries the pulse Most numerous blood vessels Contains the most elastin to stretch and recoil Carry blood to the heart Branch to form capillaries Have the highest pressure Site of diffusion Have valves Most narrow diameter Provide large surface area for exchange of materials (gases, nutrients, wastes)
The next patient seen by the same doctor was suffering from hyperkalemia and was experiencing cardiac arrhythmias. Which of the following reason/s explain/s why this patient was experiencing cardiac arrhythmias? O hyperkalemia leads to an increase in action potential generation because potassium ions in the ECF makes the resting membrane potential more negative O hyperkalemia leads to a decrease in action potential generation because the potassium ion level in the ICF will cause hyperpolarization O hyperkalemia leads to an increase in action potential generation because the high level of potassium ions in the ICF will make achieving threshold easier O a and b
Be able to describe the significance of ryanodine receptors found on the SR of cardiac contractile cells.
43.