11th Biology

Chapter 14 (Transport) F.Sc 1st Year Biology Short Questions

What is advantage of electrocardiogram?

It helps to know the abnormalities in the rhythmicity or conduction system of the heart. It may be corrected by the use of artificial pacemaker.

What are blue babies?

Failure of interatrial foramen (an opening present in the inter-atrial septum) to close or of ductus arteriosus to fully constrict results in cyanosis (blueness of skin) of new born. This is due to mixing of blood between two atria and the mixed blood is supplied to the body of newborn babies resulting in blueness of skin thus the name blue babies.

What is the wall of arteries made up?

The wall of the arteries is made up of three layers:

  • tunica intima, it is inner , made of endothelium.
  • tunica media, it is middle layer, made of thick muscular tissue and elastic fibres.
  • tunica externa or adventitia, is the outer layer, made of connective tissue and elastic fibres.

What is atherosclerosis?

It is coexisting Atheroma and arteriosclerosis. Atherosclerosis – causes narrowing and hardening of arteries. This is a major condition leading to heart attack.

Define arteriosclerosis.

It is degenerative arterial change associated with advancing age, primarily a thickening of middle layer of arteries.

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