Breathing and Exchange of Gases Test 45

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Breathing and Exchange of Gases Test 45

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Weekly Quiz Competition

Question 1
1 / -0

Select the correct sequence of events that occur during the delivery of $$O_2$$ from blood to tissue.

P: Absorption of $$CO_2$$ by the blood.
Q : Reaction of absorbed $$CO_2$$ with $$H_2$$ to form $$H_2 {CO}{_3}$$ within RBC and its conversion into $$H^+$$ and $${HCO}^{-}_{3}$$ ions.
R : Reaction of absorbed $${CO}_2$$ with $$H_2{O}$$ in plasma to form $$H_2 {CO}{_3}$$ and its conversion into $$H^+$$ and $${HCO}^{-}_{3}$$ ions.
S: Combination of $$H^+$$, $${CO}_2$$, and $${HbO}{_2}$$ to release $$O_2$$.
T: Combination of $${HCO}^{-}_{3}$$ with heme portion of $${HbO}{_2}$$ to form reduced haemoglobin and release of $$O_2$$.

A
P, Q, T

B
P, R, S

C
P, Q, S

D
P, R, T
Question 2
1 / -0

Select the correct option:
Mercury (Hg) is generally used in anaerobic respiration experiments because it does not react with ___________.

A
$${O}_{2}$$

B
$${CO}_{2}$$

C
$${H}_{2}O$$

D
$$air$$
Question 3
1 / -0

Mammalian lungs have an enormous number of minute alveoli (air sac);This is to allow

A
more surface area for diffusion of gases

B
more space for increasing the volume of inspired air

C
more nerve supply to keep the lungs working

D
more spongy texture for keeping lung in proper shape.

Solution

The number of alveoli in the human lungs has been estimated to be approximately 300 million. This enormous number of alveoli are meant to increase surface area of lungs for diffusion of gases.
Question 4
1 / -0

Given below is a sigmoid curve for oxyhemoglobin dissociation :-
Which of the following factor favour for shifting of curve (B) $$\leftarrow$$ (A)

A
Low $$PO_2$$, less $$H^+$$ concentration, less temperature.

B
High $$PO_2$$, less $$H^+$$ concentration, less temperature.

C
Low $$PO_2$$, less $$H^+$$ concentration, more temperature.

D
None of these

Solution

The curve is shifting from a to b, probably conditions might be, low oxygen, less hydrogen, and lower temperature.
So, the correct option is 'Low PO2, less H+ concentration, less temperature.'
Question 5
1 / -0

Which of the following cofactor is responsible for the activity of an enzyme leading to the formation of carbonic acid in RBCs?

A
$$Ca ^{++}$$

B
$$Zn ^{++}$$

C
$$Mn ^{++}$$

D
$$Mg ^{++}$$

Solution

The carbonic anhydrases (or carbonate dehydratases) form a family of enzymes that catalyse the interconversion between carbon dioxide and water and the dissociated ions of carbonic acid (i.e. bicarbonate and hydrogen ions). The active site of most carbonic anhydrases contains a zinc ion. They are therefore classified as metalloenzymes.
So, the correct option is 'Zn++'
Question 6
1 / -0

Read the given statements and select the correct option.
Statement 1: Respiration is most efficient in the insects, among the invertebrates.
Statement 2: In the insects, air is carried directly to the cells by tracheoles.

A
Both statements 1 and 2 are correct.

B
Statement 1 is correct but statement 2 is incorrect.

C
Statement 1 is incorrect but statement 1 is correct.

D
Both statements 1 and 2 are incorrect.

Solution

Both the statements given in the question are correct.
So, the correct answer is 'Both statements 1 and 2 are correct.'
Question 7
1 / -0

Which of the following options is incorrect about the larynx (sound box)?

A
It is a bony box.

B
Glottis is the opening into the larynx.

C
During swallowing of food glottis is covered by epiglottis to prevent food entry into the larynx.

D
All of these.
Solution
- Larynx is a cartilaginous box containing nine pieces of cartilages.
- Glottis is the opening from where esophagus and trachea gets seperated.
- To prevent food from entering into the larynx while swallowing, the epiglottis covers the opening of the larynx.
- So, the correct option is (A).
Question 8
1 / -0

Listed below are four respiratory capacities (i-iv) and four jumbled respiratory volumes of a normal human adult.
Respiratory volumes and capacities Volume of air
(i) Residual volume 2500 mL
(ii) Vital capacity 3500 mL
(iii) Inspiratory reserve volume 1200 mL
(iv) Inspiratory capacity 4500 mL
Which one of the following is the correct matching of two capacities and volumes?

A
(ii) 2500 mL, (iii) 4500 mL

B
(iii) 1200 mL, (iv) 2500 mL

C
(iv)3500mL, (i) 1200 mL

D
(i) 4500 mL; (ii) 3500 mL

Solution

Respiratory volumes and capacities Volume of air
Residual volume 1200 mL Vital capacity 4500 mL
Inspiratory reserve volume 2500 mL Inspiratory capacity 3500 mL.
Question 9
1 / -0

Fill up the blanks in the following paragraph by selecting the correct option.
The movement of air into and out of the lungs is carried out by creating a ____(i)____ between the lungs and the atmosphere. Inspiration can occur if intra-pulmonary pressure is ___(ii)____than the atmospheric pressure. Expiration takes place when the intra-pulmonary pressure is ___(iii)___ than the atmospheric pressure. Inspiration is initiated by the ___(iv)___ of diaphragm which ____(v)____ the volume of thoracic chamber in the anteroposterior axis.

A
(i) concentration gradient (ii) less (iii) higher (iv) relaxation (v)increases

B
(i) concentration gradient (ii) higher (iii) less (iv) contraction (v)decreases

C
(i) pressure gradient (ii) higher (iii) less (iv) relaxation (v)decreases

D
(i) pressure gradient (ii) less (iii) higher (iv) contraction (v) increases

Solution

The movement of air into and out of the lungs is carried out by creating an (i) pressure gradient between the lungs and the atmosphere. Inspiration can occur if the intrapulmonary pressure is (ii) less than the atmospheric pressure. Expiration takes place when the intrapulmonary pressure is (iii) higher than the atmospheric pressure. Inspiration is initiated by the (iv) contraction of the diaphragm which (v) increases the volume of the thoracic chamber in the anteroposterior axis.
So, the correct answer is '(i) pressure gradient (ii) less (iii) higher (iv) contraction (v) increases'.
Question 10
1 / -0

The carbon dioxide is transported via blood to lungs mostly

A
In combination with haemoglobin only.

B
Dissolved in blood plasma.

C
In the form of bicarbonates.

D
As carbaminohaemoglobin.
Solution
- Carbon dioxide produced during cellular respiration is carried from tissues to lungs through blood in human beings by three different mechanisms.
- 70% of carbon dioxide is transported in the form of bicarbonates while 20-25% is transported as carbamino haemoglobin in RBC.
- The remaining around 7% of carbon dioxide is transported in a dissolved state in plasma.
So, the correct answer is, 'in the form of bicarbonates'.

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Re-Attempt Weekly Quiz Competition

Respiratory volumes and capacities	Volume of air
(i) Residual volume	2500 mL
(ii) Vital capacity	3500 mL
(iii) Inspiratory reserve volume	1200 mL
(iv) Inspiratory capacity	4500 mL

Breathing and Exchange of Gases Test 45

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Breathing and Exchange of Gases Test 45

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SHARING IS CARING

Question 1

P, Q, T

P, R, S

P, Q, S

P, R, T

Question 2

$${O}_{2}$$

$${CO}_{2}$$

$${H}_{2}O$$

$$air$$

Question 3

more surface area for diffusion of gases

more space for increasing the volume of inspired air

more nerve supply to keep the lungs working

more spongy texture for keeping lung in proper shape.

Solution

Question 4

Low $$PO_2$$, less $$H^+$$ concentration, less temperature.

High $$PO_2$$, less $$H^+$$ concentration, less temperature.

Low $$PO_2$$, less $$H^+$$ concentration, more temperature.

None of these

Solution

Question 5

$$Ca ^{++}$$

$$Zn ^{++}$$

$$Mn ^{++}$$

$$Mg ^{++}$$

Solution

Question 6

Both statements 1 and 2 are correct.

Statement 1 is correct but statement 2 is incorrect.

Statement 1 is incorrect but statement 1 is correct.

Both statements 1 and 2 are incorrect.

Solution

Question 7

It is a bony box.

Glottis is the opening into the larynx.

During swallowing of food glottis is covered by epiglottis to prevent food entry into the larynx.

All of these.

Solution

Question 8

(ii) 2500 mL, (iii) 4500 mL

(iii) 1200 mL, (iv) 2500 mL

(iv)3500mL, (i) 1200 mL

(i) 4500 mL; (ii) 3500 mL

Solution

Question 9

(i) concentration gradient (ii) less (iii) higher (iv) relaxation (v)increases

(i) concentration gradient (ii) higher (iii) less (iv) contraction (v)decreases

(i) pressure gradient (ii) higher (iii) less (iv) relaxation (v)decreases

(i) pressure gradient (ii) less (iii) higher (iv) contraction (v) increases

Solution

Question 10

In combination with haemoglobin only.

Dissolved in blood plasma.

In the form of bicarbonates.

As carbaminohaemoglobin.

Solution

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