Q2 of 39 Page 143

Given alongside is a portion of the human body showing some important structure in ventral (front) view.


(a) Where is this portion located in the body?


(b) Name the structures numbered 1 – 3.


(c) State one main function of each of the structures named above.


(d) Is there any duct to carry the secretion from the structure numbered 2? If so, give its name.

(a) Thyroid gland is located in front of the neck just below the larynx.


(b) 1- Larynx


2 – Thyroid


3 – Trachea


The larynx is the voice box and a part of the respiratory tract. The thyroid is an endocrine gland which secretes thyroxine hormone. The trachea is a part of the respiratory tract.


(c) The main function of the larynx is to produce sound hence it is called voice box.


The thyroid gland secretes thyroxine which regulates basal metabolism.


The trachea is a part of the respiratory tract which helps in the passage of air during breathing. It is also called as windpipe.


(d) No, thyroid gland has no duct as it is a ductless gland. It pours its secretion directly into bloodstream.


More from this chapter

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2

Mention three important differences between the action of hormones and that of nerves in the regulatory mechanism of our body.

 1

Study the diagram given below and then answer the questions that follow:





(a) Name the cells of the pancreas that produce (1) glucagon (2) insulin.


(b) State the main function of (1) glucagon and (2) insulin.


(c) Why is the pancreas referred to as an exo-endocrine gland?


(d) Why is insulin not given orally but is injected into the body?


(e) What is the technical term for the cells of the pancreas that produce endocrine hormones?


(f) Where in the body is the pancreas located?


 3

Given alongside is an outline diagram of a human body showing the position of certain organs.


(a) Name the parts numbered 1 to 4.


(b) What is common to all these parts in regard to the nature of their function?


(c) Name the nutrient element which is essential for the normal working of part 2.

 4

Given below are two diagrams (one is correct, the other is somewhat incorrect) showing the transport of a hormone from its source gland/cell to the target organ/cell.


(a) Which one has the error – A or B?.......


(b) What is the error?........................