Which 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.
Contractile vacuole in protozoan Amoeba is meant for
respiration
excretion
locomotion
osmoregulation
Which one is component of Ornithine cycle?
Ornithine, citrulline and alanine
Ornithine, citrulline and arginine
Amino acid are not used
Ornithine, citrulline and fumaric acid
The leucocytes contain which of the following in large quantity?
Basophils
Neutrophils
Eosinophils
Monocytes
During inspiration, the diaphragm
expands
shows no change
contracts and flattens
relaxes to become dome- shaped
The function of pineal body is to
lighten the skin colours
control sexual behaviour
regulates the period of puberty
All of the above
