MCQs Biology F.Sc. Part 2 ( 2nd Year )
Chapter No.16
Support and Movements
Total MCQs = 165
111. Which of the following is unique to cardiac muscle tissue?
(A) Is involuntary
(B) Is non-striated
(C) Has intercalated discs
(D) Contains smooth muscle tissue
Answer:
(C) Has intercalated discs
112. Approximately what percentage of body heat is generated by muscle tissue?
(A) 15%
(B) 30%
(C) 55%
(D) 85%
Answer:
(D) 85%
113. A muscle of fascicle is a?
(A) Bundle of myofibrils
(B) Bundle of connective tissue
(C) Bundle of muscle fibers
(D) Muscle cell
Answer:
(C) Bundle of muscle fibers
114. Which of the following actions is caused by skeletal muscle?
(A) Constriction of blood vessels
(B) Heartbeat
(C) Dilation of pupil
(D) Eye movements
Answer:
(D) Eye movements
115. Which of the following does not occur in a muscle during contraction?
(A) Thick and thin filaments bind to each other
(B) Muscle fibers stretch
(C) Thick and thin filaments slide past each other
(D) Muscle fibers shorten
Answer:
(B) Muscle fibers stretch
116. This process aids in skeletal muscle relaxation after contraction:
(A) Calcium is released from intracellular storage sites
(B) Motor neurons send electrical signals to muscles
(C) Acetylcholinesterease degrades acetylcholine
(D) Troponin binds calcium
Answer:
(C) Acetylcholinesterease degrades acetylcholine
117. The stiffness of muscle tissue in rigor mortis partially results from:
(A) Excessive acetycholine activity on muscle
(B) Excessive calcium release in muscle
(C).Excessive lactic acid build up
(D) Excessive contraction of the fibers
Answer:
(B) Excessive calcium release in muscle
118. A single motor neuron may innervate as few as 3-5 fibers in muscles of the:
(A) Upper arms
(B) Legs
(C) Eye
(D) Heart
Answer:
(C) Eye
119. When an action potential reaches the presynaptic terminal of the motor neuron then:
(A) Calcium is released inside of the muscle fiber
(B) Acetylcholine is released into the synaptic cleft
(C) Aectylcholinesterease is released into the synaptic cleft
(D) Physical contact between the motor neuron and the muscle fiber occurs
Answer:
(B) Acetylcholine is released into the synaptic cleft
120. Lack of acetylcholinesterease in the synaptic cleft would result in.
(A) Decrease of acetylcholine production by the motor neuron
(B) Relaxation of the muscle fiber
(C) Excessive continuous stimulation of the muscle fiber
(D) Inability of the motor neuron to stimulate the muscle fiber
Answer:
(C) Excessive continuous stimulation of the muscle fiber
