Question No:1
Electron microscopic studies of the sarcomeres have revealed that during muscle contraction
[A] the width of A-band remains constant
[B] the width of the H-zone increases
[C] the width of I-band increases
[D] the diameter of the fibre increases
Question No:2
According to the sliding filament theory
[A] actin (thin filament) moves over myosin (thick filament)
[B] myosin moves over actin
[C] both myosin and actin move on each other
[D] none
Question No:3
Put the following statement in proper order to describe muscle contraction.
Signal sent by CNS via motor neuron.
Generation of action potential in the Sarcolemma.
Release of Ca+2 from Sarcoplasmic reticulum
The neurotransmitter acetylcholine released motorend plate.
Sarcomere shortern
[A] 1>2->4->3->5
[B] 1>4->4->3->5
[C] 1->4->3->2->5
[D] 5>4->3->2->1
Question No:4
Which of the following muscle gets into fatigue very early?
[A] Skeletal muscle
[B] Smooth muscle
[C] Cardiac muscle
[D] All
Question No:5
Relaxation of muscle is due to the
[A] pumping of Ca+2 into Sarcoplasmic cisternae
[B] presence of ATP
[C] conformational change in troponin and masking of actin filaments
[D] both (a) and (c)
Question No:6
Repeated activation of the muscles can lead to accumulation of ____ due to anaerobic breakdown of glycogen in there, cause fatigue
[A] Ethanol
[B] Lactic acid
[C] Citric acid
[D] Butyric acid
Question No:7
A neurotransmitter _____ which generates an action potential in the Sarcolemma.
[A] GABA
[B] Epinephrine
[C] Glycine
[D] Acetyt choline
Question No:8
Which of the following statement is correct?
[A] A motor neuron along with the muscles fibres connected to it constitute a motor unit
[B] The reaction time of the fibres can vary in different muscles
[C] Muscle fatigue is due to lactic acid formation due to anaerobic respiration
[D] All
Question No:9
The protein which maintains the muscular storage of oxygen is
[A] Myoglobin
[B] Actomyosin
[C] Myosin
[D] Haemoglobin
Question No:10
Which is not a correct difference between white and red muscles fibre?
White Muscle fibre— Red muscle fibre
Less Myoglobin – 1) More myglobin
Number of mitochondria less – 2) Number of mitochondria more
Amount of Sarcoplasmic reticulum low – 3) Amount of Sarcoplasmic reticulum high
Aerobic muscle – 4) Anaerobic muscle
[A] 1
[B] 2
[C] 3
[D] 4
Question No:11
Skeletal system consists of
[A] framework of bone
[B] few Cartilages
[C] both
[D] none
Question No:12
Cartilage has slightly pliable matrix due to
[A] Ca2+/sup>
[B] Mg2+/sup>
[C] chondroitin salts
[D] phosphorus
Question No:13
Skull is composed of
[A] cranial bones (8)
[B] facial bones (14)
[C] both
[D] none
Question No:14
The hard and protective outer covering of brain is known as
[A] Cranium
[B] Condyle
[C] Meninges
[D] All
Question No:15
Human body contains how many ear ossciles?
[A] 3
[B] 4
[C] 5
[D] 6
Locomotion and Movement Mock Exam-4
CategoriesNEET Biology