Asked by Isabella Wright on Jun 08, 2024
Verified
(1) Rate of muscle contraction when beta adrenergic receptors of the heart are stimulated
(2) Rate of muscle contraction when beta adrenergic receptors of intestinal muscle are stimulated
A) First item is greater than the second item.
B) First item is less than the second item.
C) Both items are equal or nearly equal.
Beta Adrenergic Receptors
Cell surface receptors that are sensitive to epinephrine and norepinephrine and are involved in the fight-or-flight response, affecting heart rate, muscle strength, blood pressure, and metabolism.
Muscle Contraction
The process where muscle fibers shorten or tighten, leading to movement or stabilization of body parts.
Intestinal Muscle
Smooth muscle found in the intestines, responsible for the movement of food along the digestive tract through peristalsis.
- Recognize how various physiological processes are affected by sympathetic and parasympathetic activities.
Verified Answer
ZK
Zybrea KnightJun 12, 2024
Final Answer :
A
Explanation :
When beta adrenergic receptors of the heart are stimulated, it leads to an increase in the rate and force of heart muscle contractions. In contrast, stimulation of beta adrenergic receptors in the intestinal muscles generally leads to relaxation, not an increase in contraction rate. Therefore, the rate of muscle contraction is greater in the heart than in the intestinal muscles under these conditions.
Learning Objectives
- Recognize how various physiological processes are affected by sympathetic and parasympathetic activities.