Question

1. When a cell is respiring, carbon dioxide is in ________ concentration inside the cell, causing it to diffuse out, whereas ________ is in high concentration outside the cell, causing it to diffuse in.

2.which of the following contains the most oxygen? blood entering the alveoli, blood entering the left atrium, blood leaving the right ventricle, blood leaving the tissue.

3.What effect does smoking have on the movement of mucus in the respiratory tract?

4.Frogs use their skin as a respiratory organ. True or False?

Answer 1

Ans-1

During respiration oxygen is required for oxidation of food so oxygen concentration is poor in inside of cell and as a by product of the respiration carbon dioxide accumulated within cell, So according to concentration gradient co2 from inside diffuse into outside and oxygen from outside diffuse into inside of cell.

So high, oxygen is right in blank space respectively.

Ans-2

• Blood which enter in alveoli which is deoxygenated blood or oxygen poor because if enter in alveoli for purification.
• After purification, oxygen rich blood enter from alveoli or lungs to left atrium for systematic circulation.
• Blood leaving from right ventricle is impure or deoxygenated blood collected from different part of the body and goes to lungs for purification.
• Blood leaving from tissue is metabolic waste of tissues or cells of body which consists of higher concentration of CO2 and almost nill concentration oxygen.

So blood entering in left Atrium is correct answer

Ans-3

Smoking cause cillia in respiratory tract to damage so moment of mucus in respiratory tract is distrub so mucus accumulat in bronchi which irritate sensitive tissue and cause cough.

Ans-4

When the frog is out of the water, mucus glands in the skin keep the frog moist, which helps absorb dissolved oxygen from the air.

So statement is true.