Role of Chemoreceptor in Breathing

When chemoreceptors detect a slight decrease in pH, this means that _______________ concentrations have increased, and the breathing rate must ________________ .

• Carbon dioxide; increase.

• Carbon dioxide; decrease.

• Oxygen; increase.

• Oxygen; decrease.

Which of the following are the chemoreceptors that responsible in control breathing?

• Aortic bodies

• Aorta bodies

• Carotid bodies

• Carotic bodies

which of the following explains the meaning of the Bohr effect?

• The effect of the partial pressure of oxygen in blood on the affinity of haemoglobin towards carbon dioxide.

• The effect of the partial pressure of carbon dioxide on the dissociation of oxyhaemoglobin.

• The affinity of haemoglobin toward oxygen.

• The affinity of haemoglobin towards carbon dioxide.

The partial pressure of carbon dioxide in leg muscle increases after a vigorous workout. Which of the following regulatory actions will occur to correct the above situation?

• Chemoreceptors in the respiratory and cardiovascular centres in the brain are stimulated

• The rate of heartbeat decreases

• Arterioles in the leg muscles constrict

The diaphragm is a dome-shaped skeletal muscle that forms the floor of the thoracic cavity and is innervated by fibers of the phrenic nerve.  

• True 
• False

A contraction of the diaphragm during inhalation causes it to flatten. What else does the contraction result in?

• An increase in the vertical diameter of the thoracic cavity
• Increase in alveolar pressure
• A decrease in lung volume
• A decrease in the vertical diameter of the thoracic cavity

Tags

NGSS.HS-LS1-3

Which of the following statements is true?

• The breathing rate is completely under voluntary control

• The chemoreceptors are located on the diaphragm and intercostal muscle

• During expiration, the external intercostal muscles and diaphragm contract

• CO2 released from respiration is detected by chemoreceptors in the carotid and aortic bodies of the blood system

The inspiratory center sends out nerve impulse to diaphragm via

• thoracic nerve

• phrenic nerve

• vagus nerve

A sensory that responds to chemical stimuli is called.....

• Chemical stimulus

• Chemiautotroph

• Chemoreceptor

• Chemiosmosis

When you exhale...

• ribs and sternum move up and out

• diaphragm moves down/ flattens

• External intercoastal muscles relax

• diaphragm contracts

• width of thorax increases