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.