Understanding Breathing Mechanisms

What is the primary function of the diaphragm in the respiratory system?

• To pump blood throughout the body

• To facilitate the process of breathing

• To digest food

• To filter waste from the blood

During inspiration, what happens to the diaphragm?

• It relaxes and moves upwards

• It contracts and moves downwards

• It remains stationary

• It contracts and moves upwards

Which muscles assist the diaphragm during inspiration?

• Abdominal muscles

• Intercostal muscles

• Cardiac muscles

• Smooth muscles

What occurs during expiration in terms of diaphragm movement?

• The diaphragm contracts and moves downwards

• The diaphragm relaxes and moves upwards

• The diaphragm remains stationary

• The diaphragm contracts and moves upwards

How do the intercostal muscles contribute to breathing?

• They help in the digestion of food

• They assist in the movement of the diaphragm

• They expand and contract the rib cage

• They filter air entering the lungs

Which of the following best describes the movement of the rib cage during inspiration?

• It moves downwards and inwards

• It remains stationary

• It moves upwards and outwards

• It moves downwards and outwards

Which of the following statements is true about the intercostal muscles during expiration?

• They contract to expand the rib cage

• They relax to allow the rib cage to fall

• They contract to push the diaphragm upwards

• They remain contracted

What is the primary purpose of expiration in the respiratory cycle?

• To increase the oxygen content in the blood

• To expel carbon dioxide from the body

• To absorb nutrients from the air

• To cool down the body

What happens to the volume of the thoracic cavity during inspiration?

• It increases

• It remains the same

• It decreases

• It fluctuates

What is the effect of the contraction of the intercostal muscles on the rib cage during inspiration?

• The rib cage moves inwards

• The rib cage remains stationary

• The rib cage moves upwards and outwards

• The rib cage moves downwards