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Dentistry Physiology: Respiratory System Lecture

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Dentistry Physiology: Respiratory System Lecture

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Questions and Answers

What is the normal intra-alveolar pressure during expiration?

Equal to atmospheric pressure

More than atmospheric pressure

Less than atmospheric pressure (correct)

Varies with lung volume

What is the primary function of surfactant in the lungs?

To facilitate lung expansion during inspiration

Both (a) and (b) (correct)

To increase surface tension in the alveoli

To prevent lung collapse during expiration

Which type of hypoxia is caused by a deficiency of hemoglobin?

Stagnant hypoxia

Anemic hypoxia (correct)

Histotoxic hypoxia

Hypoxic hypoxia

Which type of hypoxia is caused by the inhibition of the cytochrome system due to toxic agents?

Histotoxic hypoxia Signup and view all the answers

What is the cause of stagnant hypoxia?

Inadequate blood flow to tissues Signup and view all the answers

What are the cells responsible for gas exchange in the alveoli called?

Type I pneumocyte Signup and view all the answers

Which of the following is NOT a function of the lungs?

Production of digestive enzymes Signup and view all the answers

Which muscle is NOT involved in forced inspiration?

Diaphragm Signup and view all the answers

Which nerve supplies the diaphragm, the main muscle involved in respiration?

Phrenic nerve Signup and view all the answers

During expiration, which muscles are primarily responsible for decreasing thoracic volume?

Internal intercostal muscles Signup and view all the answers

What type of process is inspiration?

Active process Signup and view all the answers