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Respiration and Gaseous Exchange

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Questions and Answers

What is the primary function of respiration in the body?

To produce energy for the body
To provide oxygen and eliminate carbon dioxide (correct)
To regulate body temperature
To maintain blood pressure

Where does external respiration occur?

In the muscles
In the lungs (correct)
In the tissues
In the bloodstream

What is the mechanism by which gas exchange occurs?

Facilitated diffusion
Simple diffusion (correct)
Active transport
Passive transport

What is the characteristic of carbon dioxide in blood?

It is more soluble than oxygen (D) Signup and view all the answers

What is the purpose of the features of alveoli?

To speed up the rate of diffusion (A) Signup and view all the answers

What is the advantage of the alveolar epithelium being only one cell thick?

It provides a short diffusion pathway, which speeds up diffusion. (B) Signup and view all the answers

What percentage of oxygen is transported in the bloodstream as dissolved oxygen?

1.5% (B) Signup and view all the answers

What is the role of heme in the transport of oxygen in the blood?

It binds to oxygen molecules. (A) Signup and view all the answers

What is the result of the reversible chemical reaction between hemoglobin and oxygen?

The formation of oxyhemoglobin. (D) Signup and view all the answers

What is the process by which oxygen is released from hemoglobin in humans?

Oxygen dissociation. (B) Signup and view all the answers