Breathing and Exchange of Gases Test 37

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Breathing and Exchange of Gases Test 37

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Weekly Quiz Competition

Question 1
1 / -0

Oxygen carrying capacity of blood is reduced by.

A
$$CO_2$$

B
CO

C
$$SO_2$$

D
$$O_3$$
Question 2
1 / -0

Alveoli occur in ______.

A
Lungs

B
Liver

C
Kidney

D
Brain
Solution
- Alveoli are present in the lungs in about 300 millions. The alveoli have a very thin wall of squamous epithelium.
- Gas exchange takes place in alveoli and the capillaries that envelop them.
Hence, the correct answer is option A, i.e., Lungs.
Question 3
1 / -0

Carboxyhaemoglobin is produced due to.

A
CO

B
$$CO_2$$

C
$$NO^-_3$$

D
$$SO^{3-}_4$$

Solution

Carboxyhemoglobin (COHb), which normally comprises less than 1-2 % of total hemoglobin, is the product of reaction between carbon monoxide and hemoglobin. Carbon monoxide is produced endogenously but is also a common environmental pollutant; both sources contribute to the amount of COHb in blood.
So, the correct answer is 'CO'
Question 4
1 / -0

How many cartilages form larynx?

A
$$6$$

B
$$15$$

C
$$9$$

D
$$12$$

Solution

The laryngeal skeleton is nine cartilages: the thyroid cartilage, cricoid cartilage, epiglottis, arytenoid cartilages, corniculate cartilages, and cuneiform cartilages. The first three are unpaired cartilages, and the latter three are paired cartilages.
So, the correct answer is '9'
'
Question 5
1 / -0

Oxygen binding to haemoglobin is

A
Directly proportional to $$CO_2$$ concentration

B
Directly proportional to CO concentration

C
Inversely proportional to $$CO_2$$ concentration

D
Independent of CO concentration
Solution
- With the increase in the level of CO$$_2$$, the pH of blood becomes acidic and simultaneously haemoglobin's affinity for oxygen decreases.
- This means that haemoglobin holds on to oxygen-less tightly, thus releasing it more readily.
- So, oxygen binding to haemoglobin is inversly proportional to CO$$_2$$ concentration.
Question 6
1 / -0

Read the following statements regarding the mechanism of respiration and choose the correct option.
$$1$$. Inspiration occurs only when there is negative pressure in the lungs with respect to the atmosphere.
$$2$$. Expiration takes place only when intrapulmonary pressure is lower than atmospheric pressure.
$$3$$. Pressure gradients are generated with the help of the diaphragm and intercostal muscles.
$$4$$. Inspiration is initiated by the relaxation of the diaphragm.
$$5$$. Contraction of the diaphragm reduces pulmonary volume and increases intrapulmonary pressure causing expiration.

A
$$1, 2$$ and $$5$$ correct

B
$$2$$ only correct

C
$$2, 5$$ correct

D
$$1, 3$$ correct

E
$$1, 4$$ correct
Solution
- A pressure gradient is the pressure difference between the lungs and the atmosphere generated with the help of the diaphragm and intercostal muscles.
- Inspiration involves the contraction of diaphragm and external intercostal muscles whereas expiration involves relaxation of diaphragm and contraction of internal intercostal muscles.
- In humans, inspiration is an active process. During the resting state, the diaphragm is dome-shaped. On contraction, it turns flat which increases the size of the thoracic chamber anteroposteriorly. The intrapulmonary pressure becomes negative with respect to the atmosphere and the air moves in.
- At the resting state, expiration is a passive process. It occurs due to elastic recoil of the lungs. When the intrapulmonary pressure is increased with respect to the atmosphere, and the diaphragm is relaxed the expiration took place.
Statements 1 and 3 correct. Hence the correct answer is an option (D).
Question 7
1 / -0

Find the correctly matched pair.

A
$$CO_2$$ transported by RBCs about $$3\%$$

B
$$CO_2$$ carried in dissolved state through plasma- $$20-25\%$$

C
$$O_2$$ transported by RBCs in blood - $$97\%$$

D
$$CO_2$$ carried as bicarbonate -$$7\%$$

E
$$O_2$$ carried in dissolved state through plasma - $$7\%$$

Solution

About 97 % of oxygen is transported by RBC. The remaining 3% is dissolved in plasma and transported.
Hence, the correct answer is (C)
Question 8
1 / -0

What is $$pO_2$$ and $$pCO_2$$ in synthematic arteries?

A
$$pO_2$$ $$40$$mm Hg, $$pCO_2$$ $$45$$mm Hg

B
$$pO_2$$ $$95$$mm Hg, $$pCO_2$$ $$104$$mm Hg

C
$$pO_2$$ $$95$$mm Hg, $$pCO_2$$ $$40$$mm Hg

D
$$pO_2$$ $$45$$mm Hg, $$pCO_2$$ $$40$$mm Hg

E
$$pO_2$$ $$104$$mm Hg, $$pCO_2$$ $$159$$mm Hg

Solution
Question 9
1 / -0

Increased body temperature makes oxygenhaemoglobin dissociation curve to.

A
Shift right

B
Shift left

C
Become parabolic

D
Become hyperbolic

Solution

At higher blood plasma temperatures, the hemoglobin becomes less likely to bind to oxygen and much more likely to unload to into the cells of the tissue. Therefore, as temperature increases, this shifts the entire oxygen-hemoglobin dissociation curve to the right.
Hence, the correct answer is (A)
Question 10
1 / -0

A chemosensitive area adjacent to the rhythm centre in the brain is highly sensitive to
I. O$$_2$$
II. CO$$_2$$
III. H$$^+$$ ions
IV. HCO$$_3$$ ions
V. Water

A
I only

B
II and III only

C
I and IV only

D
V only

E
I and V only
Solution
- Central chemoreceptors are located on the medulla oblongata near the medullar respiratory groups of the respiratory centre and are primarily sensitive to changes in the pH (concentration of H$$^+$$ in the blood), resulting from changes in the levels of carbon dioxide.
So, the correct answer is option B.

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Breathing and Exchange of Gases Test 37

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Breathing and Exchange of Gases Test 37

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SHARING IS CARING

Question 1

$$CO_2$$

CO

$$SO_2$$

$$O_3$$

Question 2

Lungs

Liver

Kidney

Brain

Solution

Question 3

CO

$$CO_2$$

$$NO^-_3$$

$$SO^{3-}_4$$

Solution

Question 4

$$6$$

$$15$$

$$9$$

$$12$$

Solution

Question 5

Directly proportional to $$CO_2$$ concentration

Directly proportional to CO concentration

Inversely proportional to $$CO_2$$ concentration

Independent of CO concentration

Solution

Question 6

$$1, 2$$ and $$5$$ correct

$$2$$ only correct

$$2, 5$$ correct

$$1, 3$$ correct

$$1, 4$$ correct

Solution

Question 7

$$CO_2$$ transported by RBCs about $$3\%$$

$$CO_2$$ carried in dissolved state through plasma- $$20-25\%$$

$$O_2$$ transported by RBCs in blood - $$97\%$$

$$CO_2$$ carried as bicarbonate -$$7\%$$

$$O_2$$ carried in dissolved state through plasma - $$7\%$$

Solution

Question 8

$$pO_2$$ $$40$$mm Hg, $$pCO_2$$ $$45$$mm Hg

$$pO_2$$ $$95$$mm Hg, $$pCO_2$$ $$104$$mm Hg

$$pO_2$$ $$95$$mm Hg, $$pCO_2$$ $$40$$mm Hg

$$pO_2$$ $$45$$mm Hg, $$pCO_2$$ $$40$$mm Hg

$$pO_2$$ $$104$$mm Hg, $$pCO_2$$ $$159$$mm Hg

Solution

Question 9

Shift right

Shift left

Become parabolic

Become hyperbolic

Solution

Question 10

I only

II and III only

I and IV only

V only

I and V only

Solution

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