Choose the wrong statement
During inspiration:

(a)

Diaphragm contracts

(b)

Sternum is pulled downward

(c)

Volume of thoracic chamber increases

(d)

External intercostal muscles contract

Under normal conditions every 100mL of oxygenated blood can deliver about _____________ of oxygen to the tissues.

(a)

8 mL

(b)

5 ml

(c)

10 mL

(d)

50 mL

Assertion (A): Larynx occurs in the upper part of neck.
Reason (R): It is closed during swallowing process

(a)

A and R are right

(b)

A is right and R explains A

(c)

A and R are wrong

(d)

A is right R is wrong

The tracheal tube of human is supported by ________

(a)

Bones

(b)

Cartilaginous rings

(c)

Tracheal filaments

(d)

Epiglottis.

An average, a healthy human breathes ___________ times/minute.

(a)

12-16

(b)

13-17

(c)

12-18

(d)

10-16