28. During childbirth, the endocrine hormone oxytocin causes muscle contraction
ID: 3521421 • Letter: 2
Question
28. During childbirth, the endocrine hormone oxytocin causes muscle contraction in the uterus The other muscles in the mother's body do not contract. Which statement correctly explains this scenario? A) The non-uterine muscles in the mother's body do not contain receptors for oxytocin B) Endocrine hormones such as oxytocin do not travel through the blood, so they do not make contact with non-uterine muscles C) Oxytocin is released by the uterus only, so other muscles do not receive its signals D) Oxytocin is released by the fetus and diffuses into the amniotic fluid inside the uterus Therefore, only uterine muscles are stimulated E) The other muscles in the mother's body are temporarily paralyzed by the epidural, a medication intended to prevent pain. 29. For a hormone to act on a cell, Calcium is acting as a(n) A) Second messenger. B) Energy carrier C) Intercellular enzyme D) Target cell E) Hormone 30. Actin filaments A) Are the thick filaments B) Connected with troponin and tropomycin. C) Are the thin filaments. D) Both A and B E Both and C.Explanation / Answer
28. Correct answer:- (A) the non uterine muscles in the mother's body do not contain receptors for oxytocin.
Explanation:- uterine muscles contain alpha and beta receptors for oxytocin, so these contract during labor.
(B) oxytocin released by posterior pituitary and travel through blood. So this is wrong option.
(C) Oxytocin not only released by uterus but also posterior pituitary.
29. Correct answer:- (A) second messenger
Explanation:-
- calcium act as second messenger.
- Second messengers are intracellular signaling molecules released by the cell in response to exposure to extracellular signaling molecules—the first messengers.
30. Correct answer:- (E) both B and C
Explanation:- actin is thin filament that contain
tropomyosin and troponin.
- Myosin are thick filament.
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.