What changes occur in the voice of boys and girls during puberty?
The voice box or the larynx begins to grow during puberty. The growth is more in the boys and the larynx can be seen as the protruding part of th throat. The protruding part is known as the Adam's apple. The voice of the boys becomes deep. In boys the voice becomes hoarse temporarily because of the out of control growth of muscles of the voice box. The voice box is growth is less in girls and they have a high pitched voice.
Adolescence is the period of life, when the body undergoes changes, leading to reproductive maturity. It begins around the age of 11 and lasts upto 18 or 19 years of age. In girls adolescence may begin one or two year earlier than boys.
What is menstruation? Explain.
Menstruation is the bleeding in women because of the shedding of the thick lining of the uterus. the walls of the uterus shed when the fertilization does not take place. Menstruation occurs once in about 28 to 30 days.
Prepare a Table having two columns depicting names of endocrine glands and hormones secreted by them.
(iii) Adrenal glands
(iv) Pituitary gland
(iv) Growth hormones
List the changes in the body that take place at puberty.
The changes that take place in the body at age of puberty are:
(i) Increase in height.
(iii) Change in body shape..
(iv) Change in voice.
(v) Incresed activity of sweat and sebaceous gland.
(vi) Development of sex orgnans.
(vii) Development of secondary sexual charater like fascial hair in boys and breasts in females.
(viii) Attaining the mental, intellectual and emotional stability.
What is the term used for secretions of endocrine glands responsible for changes taking place in the body?