Column A Column B 1 . Cerebrum ( a ) Control heartbeat 2 . Medulla oblongata ( b ) Thyroid 3 . Hormones ( c ) Balance of the body 4 . Cerebellum ( d ) Centre for intelligence 5 . Goitre ( e ) Chemical messengers 6 . Stress ( f ) Adrenal gland

1 - d Cerebrum is the uppermost and largest part of the brain. Centre for intelligence and memory. 2 - a Medulla oblongata is the lowest part of the brain and controls the activity of internal organs (like heartbeat and breathing). 3 - e Chemical coordination in living organisms is brought about by chemical substances called hormones. The hormones are produced in special organs, which are called endocrine glands. 4 - c Cerebellum is a small area located just under the cerebrum at the back of the head. Maintains balance of the body. It coordinates muscular activity. 5 - b Goitre is an abnormal enlargement of your thyroid gland. Thyroid gland is a butterfly-shaped gland located at the base of the neck just below the Adam's apple. Worldwide, over 90 % of goitre cases are caused by iodine deficiency. 6 - f Cortisol is the called the stress hormone because it is secreted during stress. It is secreted by the adrenal gland. Adrenal glands are small, triangular-shaped glands located on top of both kidneys. Column A Column B 1 . Cerebrum ( d ) Centre for intelligence 2 . Medulla oblongata ( a ) Control heartbeat 3 . Hormones ( e ) Chemical messengers 4 . Cerebellum ( c ) Balance of the body 5 . Goitre ( b ) Thyroid 6 . Stress ( f ) Adrenal gland

E M B I B E

Learning Elementary Biology for Class 8>Chapter 6 - Circulatory System>TEST YOURSELF>Q IV

HARD

8th ICSE

IMPORTANT

Earn 100

List the differences between blood and lymph.

Important Questions on Circulatory System

HARD

8th ICSE

IMPORTANT

Learning Elementary Biology for Class 8>Chapter 6 - Circulatory System>TEST YOURSELF>Q IV

Draw a neat well-labelled outline diagram showing the internal structure of human heart.

HARD

8th ICSE

IMPORTANT

Learning Elementary Biology for Class 8>Chapter 6 - Circulatory System>TEST YOURSELF>Q IV

With the help of an illustration describe the various parts of human heart.

HARD

8th ICSE

IMPORTANT

Learning Elementary Biology for Class 8>Chapter 6 - Circulatory System>THEME ASSIGNMENT>Q I

Column A	Column B
$1 .$ Cerebrum	$(a)$ Control heartbeat
$2 .$ Medulla oblongata	$(b)$ Thyroid
$3 .$ Hormones	$(c)$ Balance of the body
$4 .$ Cerebellum	$(d)$ Centre for intelligence
$5 .$ Goitre	$(e)$ Chemical messengers
$6 .$ Stress	$(f)$ Adrenal gland