1. What is Adam’s apple?
2. What are duct glands?
3. Name two duct and ductless glands.
4. Which control changes at adolescence?
5. How many chromosomes are present in the nucleus of a single sperm?
6. What is goiter?
Dear student,
1. At puberty,the voice box or larynx increases in size. It increases more in boys than girls. Due to large voice boxes, boys have deep voice. however in girls, the voice box is small and they have large pitched voice.
The enlarged voice box in boys can be seen as a prominent lump in the neck region. It is called Adam's apple.
2. These glands secrete their products into ducts which takes it to the external environment. For example salivary gland, sweat gland. They are also known as exocrine glands.
3. Duct glands: Salivary Gland, Sweat Gland & Ductless glands: Pituitary Gland, & Thyroid Gland.
4.The changes which occur at adolescence are controlled by hormones (chemical substances). These are secretions from endocrine glands & exoocrine glands.
5. Sperms contain half the number of chromosomes as found in normal non reproductive cells of human. Non reproductive cells of human contains 46 chromosomes so, sperm contains 23 chromosomes in its nucleus.
6. Goiter is a disease of the thyroid gland in which it becomes enlarged. Iodine is a necessary constituent of a person's diet. It is a component of Tri and tetraiodothyronine, the precursor molecules from which thyroxine is made. As the people living in south live near sea and consume more sea food which is rich in iodine than people living in north. This is the reason that goiter is very common in north India.
Regards
1. At puberty,the voice box or larynx increases in size. It increases more in boys than girls. Due to large voice boxes, boys have deep voice. however in girls, the voice box is small and they have large pitched voice.
The enlarged voice box in boys can be seen as a prominent lump in the neck region. It is called Adam's apple.
2. These glands secrete their products into ducts which takes it to the external environment. For example salivary gland, sweat gland. They are also known as exocrine glands.
3. Duct glands: Salivary Gland, Sweat Gland & Ductless glands: Pituitary Gland, & Thyroid Gland.
4.The changes which occur at adolescence are controlled by hormones (chemical substances). These are secretions from endocrine glands & exoocrine glands.
5. Sperms contain half the number of chromosomes as found in normal non reproductive cells of human. Non reproductive cells of human contains 46 chromosomes so, sperm contains 23 chromosomes in its nucleus.
6. Goiter is a disease of the thyroid gland in which it becomes enlarged. Iodine is a necessary constituent of a person's diet. It is a component of Tri and tetraiodothyronine, the precursor molecules from which thyroxine is made. As the people living in south live near sea and consume more sea food which is rich in iodine than people living in north. This is the reason that goiter is very common in north India.
Regards