The blood calcium level is lowered by the deficiency of
parathormone
thyroxine
calcitonin
calcitonin
A.
parathormone
The chief cells of the parathyroids secrete parathormone. Its deficiency causes the lowering of blood calcium level. This increases the excitability of nerves and muscles causing cramps and convulsions. This caused parathyroid tetany characterised by sustained contractions of the muscles of larynx, face, hands and feet.
Calcitonin is secreted when calcium level is high in blood it has an opposite action to that of parathyroid hormone and lowers the calcium level by suppressing the release of calcium ions from the bones.
Thyroxine is secreted from the thyroid gland. It regulates the metabolic rate of the body and thus, maintain basal metabolic rate, stimulate protein synthesis and therefore, promote the growth of the body tissue.
The most popularly known blood grouping is the ABO grouping. It is named ABO and not ABC, because 'O' in it refers to having
other antigens besides A and B on RBCs
over dominance of this type on the genes for A and B types
one antibody only-either anti-A or anti- B on the RBCs
one antibody only-either anti-A or anti- B on the RBCs
Globulins contained in human blood plasma are primarily involved in
defence mechanisms of the body
the osmotic balance of body fluids
oxygen transport in the blood
oxygen transport in the blood
In a standard ECG, which one of the following alphabets is the correct representation of the respective activity of the human heart?
R-repolarisation of ventricles
S- start of systole
T -end of diastole
T -end of diastole
The haemoglobin content per 100 mL of blood of a normal healthy human adult is
5-11 g
25-30 g
17-20 g
17-20 g
What is true about RBCs in humans?
They carry about 20-25 percent of CO2
They transport 99.5 percent of O2
They transport about 80 percent oxygen only and the rest 20 percent of it is transported in dissolved state in blood plasma
They transport about 80 percent oxygen only and the rest 20 percent of it is transported in dissolved state in blood plasma
Compared to blood our Lymph has
no plasma
plasma without proteins
more WBCs and no RBCs
more WBCs and no RBCs
ABO blood grouping is controlled by gene I, which has three alleles and show codominance, There are six genotypes. How many phenotypes in all are possible.?
Six
Three
Four
Four
If due to some injury the chordae tendinae of the tricuspid valve of the human heart is partially non-functional, what will be the immediate effect?
The flow of blood into the aorta will be slowed down
The 'pacemaker' will stop working
The blood will tend to flow back into the left atrium
The blood will tend to flow back into the left atrium
Jaundice is a disorder of
excretory system
skin and eyes
digestive system
digestive system
