Question

define refractive index. define pole, centre of curvature. state the function of testes , epididymis, gall bladder, pulmonary artery

Answer 1

Answer:

testes is site of spermatogenesis

epididymis stores and provides nutrition to sperms

gall bladder helps in digestion of fats

pulmonary artery carries deoxygenated blood to the heart

Answer 2

Answer:

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• In optics, the refractive index of a material is a dimensionless number that describes how fast light travels through the material. It is defined as where c is the speed of light in vacuum and v is the phase velocity of light in the medium.

• The point where the principal axis pierces the mirror is called the pole of the mirror. Compare this with the poles of the earth, the place where the imaginary axis of rotation pierces the literal surface of the spherical earth.

• The centre of a circle which passes through a curve at a given point and has the same tangent and curvature at that point.

• The testes have two functions – to produce sperm and to produce hormones, particularly testosterone. Sperm are produced in the seminiferous tubules of the testes.

• Epididymis — The epididymis is a long, coiled tube that rests on the backside of each testicle. It functions in the carrying and storage of the sperm cells that are produced in the testes.

• The gallbladder is a pear-shaped, hollow structure located under the liver and on the right side of the abdomen. Its primary function is to store and concentrate bile, a yellow-brown digestive enzyme produced by the liver. The gallbladder is part of the biliary tract.

• The pulmonary arteries and the pulmonary veins are the vessels of the pulmonary circulation; which means they are responsible for carrying the oxygenated blood to the heart from the lungs and carrying the deoxygenated blood from the heart to the lungs.