Multiple Choice QuestionsWhich of the following is important for muscle contraction and nerve impulse transmission?
Ca2+ ions
Mg2+ ions
Both (a) and (b)
Fe2+ ions
A.
Ca2+ ions
Ca2+ ions are essential for muscle contraction, neutro- muscular functions and nerve impulse transmission. During its transmission, impulse arrives at a synaptic knob, Ca2+ ions diffuse into the knobs from surrounding tissue fluid.
It basically triggers a process in which numerous synaptic vesicles fuse with the membrane of the knob and the areas of fusion break down, releasing the contents of vesicles into the fluid of synaptic clefts.
Sigmoid notch is formed by
cavity formed by humerus
cavity formed by radius-ulna
cavity formed by tibia-fibula
cavity formed by femur
An acromian process is characteristically found in the
pelvic girdle of mammals
skull of frog
pectoral girdle of mammals
sperm of mammals
Which of the following pairs is correctly matched?
Cartilaginous joint - Skull bones
Hinge joint - Between vertebrae
Fibrous joint - Between phalanges
Gliding joint - Between zygapophyses of the successive vertebrae
The thin filaments of a muscle fibre are made up of
actin, troponin, tropomyosin
actin, troponin
myosin, troponin
actin, tropomyosin
Which of the following is a transparent tissue
Tendon
Hyaline cartilage
Fibrous cartilage
All of these
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