All these Physiology MCQs are specially framed to strengthen the conceptual understanding of different biology topics. Human Physiology MCQ with answers covers multiple concepts such as human digestion, nervous system, human reproduction, body fluids and circulation, breathing and exchange of gases, renal System, respiratory System, Git and Liver, endocrinology, locomotor and moment in human Sense Organs, Reflex Actions, Spinal Nerve, Physiology of Urine Formation, insulin physiology – and much more. All these topics are chosen from trusted and best reference books on physiology. These physiology MCQs with answers are also helpful for the preparation of various interviews, entrance examinations, other competitive examinations, and certifications for all Experienced, Freshers and Students. Also, check MCQs on Pharmacology here.

251. The contractile element in a skeletal muscle is present in______________?

A. Sarcolemma
B. Sarcoplasm
C. Myofibril
D. Endomysium

252. Which is caused by acetylcholine through nicotinic receptors_____________?

A. Contraction of skeletal muscle
B. Decrease of heart rate
C. Secretion of saliva
D. Contraction of pupils

253. Which one of the following is a regulatory protein of the muscle ?

A. Troponin
B. Myosin
C. Actin
D. Protein- C

254. Skeletal muscles_____________?

A. Contracts when calcium is taken up by sarcoplasmic reticulum
B. Contracts when actin and myosin filaments shorten
C. Contraction is initiated by calcium binding to troponin
D. Contraction is initiated by calcium binding to tropomyosin

255. Cardiac muscle contracts due to______________?

A. Extracellular Ca+2
B. Sarcoplasmic ca+2
C. Extracellular Na+
D. Intracellular Na+

256. All are features of skeletal muscle except______________?

A. Cylindrical
B. Transverse striation
C. Centrally placed nuclei
D. Multiple nuclei

257. Rigor mortis results after death is due to________________?

A. Failure of acetylcholine to diffuse
B. Failure of ATP supply
C. Failure of break down of calcium bridges
D. None of the above

258. The skeletal muscle action potential______________?

A. Is not essential for contraction to occur
B. Has a prolonged plateau phase?
C. Spreads in ward to all parts of the muscle via the t- tubule system
D. Begins with an, in ward movement of K+ ins

259. Electromyography is used for________________?

A. To study muscle activity
B. Determine class II malocclusion
C. Determine the centric relation
D. Determine the centric occlusion

260. Skeletal muscles______________?

A. Contracts when calcium is taken up by sarcoplasmic reticulum
B. Contracts when actin and myosin filaments shorten
C. Contraction is initiated by calcium binding to troponin
D. Contraction is initiated by calcium binding to tropomyosin

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