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- 1. Multiple Choice
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.
- 2. Multiple Choice
Which of the following are the chemoreceptors that responsible in control breathing?
Aortic bodies
Aorta bodies
Carotid bodies
Carotic bodies
- 3. Multiple Choice
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.
- 4. Multiple Choice
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
- 5. Multiple ChoiceThe diaphragm is a dome-shaped skeletal muscle that forms the floor of the thoracic cavity and is innervated by fibers of the phrenic nerve.TrueFalse
- 6. Multiple ChoiceA 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 cavityIncrease in alveolar pressureA decrease in lung volumeA decrease in the vertical diameter of the thoracic cavity
- 7. Multiple Choice
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
- 8. Multiple Choice
The inspiratory center sends out nerve impulse to diaphragm via
thoracic nerve
phrenic nerve
vagus nerve
- 9. Multiple Choice
A sensory that responds to chemical stimuli is called.....
Chemical stimulus
Chemiautotroph
Chemoreceptor
Chemiosmosis
- 10. Multiple Choice
When you exhale...
ribs and sternum move up and out
diaphragm moves down/ flattens
External intercoastal muscles relax
diaphragm contracts
width of thorax increases
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