Sebaceous glands secrete sebum which causes acne and pimples in adolescents.

The protruding part of the throat seen in boys is also called larynx.

Adrenaline is a hormone produced by the adrenal glands during high stress or exciting situations. This powerful hormone is a part of the human body's acute stress response system, also called the "fight or flight" response.

Suresh's father was suffering from ‘diabetes’ because his pancreas was not producing the hormone insulin in sufficient quantities.

Changes seen in a boy during puberty are : a) Wider chest b) Broadening of shoulders

If fertilisation does not occur, the released egg and the thickened lining of the uterus along with its blood vessels are shed off. This causes bleeding in women which is called menstruation. Menstruation occurs once in about 28 to 30 days.

Pituitary gland is attached to the brain.

Handshake or physical contact doesn't spread AIDS virus.

An unfertilised egg always has an X chromosome.

Thyroxine production requires the presence of iodine.

Adrenal gland is present above each kidney.

Metamorphosis is a profound change in form from one stage to the next in the life history of an organism, as from the caterpillar to the pupa and from the pupa to the adult butterfly.

Endocrine glands are called ductless glands because they release their secretions in blood directly. Also, their secretions are called hormones.

Insulin is a hormone secreted by the pancreas. It plays a key role in the regulation of blood glucose levels.

Adrenals also produce the hormone adrenalin. It helps the body to adjust to stress when one is very angry, embarrassed or worried.