Science [5 marks Questions]

i. Pituitary gland secretes growth hormone that regulates the growth and development of the body.
ii. Thyroxin hormone is secreted by the thyroid gland that is responsible for the carbohydrate, protein, and fat metabolism in the body.
iii. A pair of adrenal glands located on kidneys prepares the body to deal with stress, anxiety, and emergency situations.
iv. The pancreas secretes insulin that regulates our blood sugar levels.
v. Endocrine glands are ductless glands that secrete hormones to regulate many body functions, including growth, development, reproduction, and metabolism.

a. The sequence of events in the uterus of a human female from fertilisation of egg till childbirth are:
- Uterus prepare itself with the development of a thick lining which is richly supplied with blood to nourish the growing embryo.
- The embryo gets nutrition from mother's blood with the help of a special tissue called placenta.
- Disc like structure in the uterine wall contain villi on the embryo's side of the tissue and blood spaces/ capillaries from mother's sides.
- It passes glucose and oxygen from mother to the embryo and waste substances from embryo to the mother.
- The child gets developed inside the mother's body in ninemonths and is born as a result of rhythmic contractions of the muscles in the uteres.
b. If fertilization of the egg does not occur, the thick and spongy lining of the uterus break and comes out through vagina as blood and mucous ie mensuration occurs.