Control and coordination Worksheet-20

Control and coordination Worksheet-20

 

Subjective questions:

  1. State one main function of cerebrum.

 

  1. Which part of the brain is most important? Why?

 

  1. What is spinal cord? How is it protected?

 

  1. Explain why brain and spinal cord are considered as central nervous system.

 

  1. Name the hormone which is associated with the metabolism of carbohydrates, proteins, calcium and phosphorus.

 

  1. Name the hormone secreted by pancreas. State one function.

 

  1. Why is pituitary called the master gland?

 

  1. Why hormones are called as 'chemical messengers'?

 

  1. Name the hormone secreted by the adrenal gland.

 

  1. Give the function of thyroxine hormone.

 

  1. How is iodine important to our body?

 

  1. Name the part of human body in which the adrenal and pituitary glands are located.

 

  1. State the position of thyroid and adrenal glands in man.

 

  1. Why are endocrine glands called ductless glands?

 

  1. What are the functions of the Hypothalamus?

 

  1. Which part of the brain controls the body temperature and blood pressure?

 

  1. What is the function of a receptor?

 

  1. Name a structure associated with nervous system which is integrated with endocrine system and also secretes hormones.

 

  1. Name three stimuli which act on plants.

 

  1. What is the stimulus in

(a) Phototropism      (b) Geotropism and (c) Chemotropism?

 

Answer:

  1. Cerebrum is the region of memory, speech, reasoning, etc.

 

  1. Medulla oblongata is the most important part of the brain because it controls all the involuntary actions like heart beat and breathing.

 

  1. Spinal cord is a part of the central nervous system and is the centre for reflex actions. It is protected inside the neural cavity of the vertebral column.

 

  1. Brain and spinal cord controls all the activities of the body by cranial nerves and spinal nerves.

 

  1. Thyroxine.

 

  1. Insulin and Glucagon.

Its function is to balance the blood glucose level in the body.

 

  1. The pituitary gland controls the activity of other endocrine glands so it is called the master gland.

 

  1. Hormones are carried in the blood streams to all parts of the body, so they are called 'chemical messengers'.

 

  1. Adrenalin.

 

  1. Thyroxine hormone controls the basal metabolism of carbohydrates, fats and proteins in the body.

 

  1. Iodine is needed for the synthesis of thyroxine. Its deficiency causes goitre.

 

  1. Adrenal - Above kidney and Pituitary- Brain.

 

  1. Thyroid- Either side of trachea just below larynx. Adrenal- Above Kidney.

 

  1. Endocrine glands are called ductless glands because they do not have any external duct to discharge their secretions into the Wood stream.

 

  1. Hypothalamus regulates the secretion of

hormones from pituitary gland.

 

  1. Hypothalamus.

 

  1. Function of a receptor is to receive stimuli from outside or inside the body and pass the impulses to the nervous system.

 

  1. Hypothalamus.

 

  1. Light, Gravity and Chemicals.

 

  1. (a) Light (b) Gravity (c) Chemicals.