The Endocrine System — Biology STD 10 — Question

In the pancreas, which of the cells secrete insulin and decrease the glucose level of blood?

Which physiologist first contributed in coining the term "Hormone" ?

Which protein is used in preventing clotting of blood?

Assertion (A): Menstrual cycle is controlled by hormones secreted by the pituitary gland and the ovaries.
Reason (R): Menstruation occurs when the lining of the uterus breaks down and is discharged along with blood through the vagina.

The major air pollutant/s is/are

Column 2 is a list of items related to ideas in Column 1. Match the term in Column 2 with the suitable idea given in Column 1.

Column 1	Column 2
(i) Superior vena cava	(a) Collect deoxygenated blood from the wall of the heart.
(ii) Inferior vena cava	(b) Carry oxygenated blood to heart muscle.
(iii) Pulmonary vein	(c) Collects deoxygenated blood from upper part.
(iv) Coronary veins	(d) Collects deoxygenated blood from lower parts.
(v) Coronary artery	(e) Brings oxygenated blood from lungs.
(vi) Aorta	(f) Large artery
(vii) Heart attack	(g) Large vein
(viii) Blood Pressure	(h) Oxygenated blood
(ix) Tricuspid valve	(i) Sphygmomanometer
(x) Bicuspid valve	(j) Allows blood flow from right auricle to right ventricle.
(xi) Contraction and relaxation of heart	(k) Blocking of coronary arteries.
	(l) Cardiac muscle.
	(m) Allows blood flow from left auricle to left ventricle.
	(n) Allows blood flow from right ventricle of pulmonary aorta.

The change in focal length of an eye lens to focus the image of objects at varying distances is done by the action of the :

Damage and errors in DNA cause ___________.

The impact of immigration on population density is: