Asked by Breanna Andrade on Jul 20, 2024
Verified
An increase in extracellular Ca2+ generally increases
A) the heart rate.
B) the force of contraction.
C) autonomic stimulation of the heart.
D) Na+ channel opening.
E) the frequency of the action potentials.
Extracellular Ca2+
Calcium ions present outside of cells, playing significant roles in blood coagulation, neurotransmitter release, and muscle contraction.
Force Of Contraction
The intensity or strength of muscle fiber contractions.
- Appreciate the effects of autonomic nervous system activity on the modulation of heart rate and contractility.
Verified Answer
SE
Silvia EllisJul 24, 2024
Final Answer :
B
Explanation :
An increase in extracellular calcium generally increases the force of contraction of the heart, as calcium ions play a crucial role in the excitation-contraction coupling process, enhancing the strength of myocardial muscle contractions.
Learning Objectives
- Appreciate the effects of autonomic nervous system activity on the modulation of heart rate and contractility.
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