Which of the following element is required for production of thyroxin?
NaCl
Iodine
Bromine
Fluorine
B.
Iodine
Iodine is required for the production of thyroxin. Thyroid cells are the only cells in the body that can absorb iodine. It is converted into thyroxine (T4) and triiodothyronine (T3). Body cell combine it and amino acid tyrosine to make T3 and T4.
Receptors for FSH is present on:
Leydig cells
Sertoli cells
Peritubular cells
Spermatogonium germ cells
During gametogenesis in male, cell during development are termed as primary spermatocytes when they are :
Before meiosis - I
After meiosis - I
After meiosis - II
Mature sperms
Neuropeptides and neurotransmitters are molecules secreted by neuron. Which statement is correct statement about neuropeptide as compare to neurotransmitter?
Less potent and short acting
More potent but short acting
Less potent but long acting
More potent and longer acting
There is small gap between two neurons at synapses. the purpose of gap is
unidirectional flow of information
reabsorption of neurotransmitter
Coupling of charge over membrane
slow down speed of propagation
Which of the following is not a characteristic of phylum Chordata?
Pharyngeal slits
Amniotic egg
Post and tail
Notochord
If the core body temperature of a human rise above normal, which of the following processes would be initiated sequentially for thermo‐regulation?
Peripheral vasodilation, increased rate of respiration, tachycardia
Peripheral vasodilation, increased rate of respiration, bradycardia
Peripheral vasodilation, decreased rate of respiration, tachycardia
Peripheral vasodilation, decreased rate of respiration, bradycardia
During urine formation the filtration of blood at the glomerulus is
An active process
An osmotic process
Is a pressure- dependent physical process
An non-energy- mediated transport process
Which statement is not correct for blood?
Mature RBC is of larger size as compare to its precursor cells
Platelets play important role in blood clotting
Neutrophils are major phagocytic cells
Basophils are present in least amount
When a person enters a dark room from bright sunlight he cannot see anything for a few seconds because
Rhodopsin pigment of rod cells is inactivated in bright light which takes time and is activated in dark and associate with opsin protein.
Scotoposin proteins of rods are denatured
All Scotoposin are bound with retinal in rod cells
All Scotoposin becomes non-functional in bright light