Asked by Jacques Naugaus on Jun 17, 2024
Verified
The spontaneous opening of Na+ channels marks the beginning of ________ of a cardiac muscle cell.
A) depolarization
B) repolarization
C) hyperpolarization
D) isopolarization
E) afterpolarization
Depolarization
The process of reduction in electric charge across a cell membrane, typically initiating a neural impulse or muscle contraction.
Cardiac Muscle Cell
Specialized cardiac muscle cells that involuntarily and rhythmically contract to circulate blood throughout the body.
- Comprehend the electrical behavior of the heart, encompassing action potentials within cardiac muscle cells.
Verified Answer
KE
Kelasia EdwardsJun 22, 2024
Final Answer :
A
Explanation :
The spontaneous opening of Na+ (Sodium) channels marks the beginning of depolarization of a cardiac muscle cell, as it allows Na+ ions to enter the cell, making the inside more positive.
Learning Objectives
- Comprehend the electrical behavior of the heart, encompassing action potentials within cardiac muscle cells.