USMLE Step 1 Respiratory Physiology Review 61 16 Chemoreceptors

USMLE Step 1 Respiratory Physiology Review 61 16 Chemoreceptors

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Play USMLE Audio MP3  61 16 Chemoreceptors Below

Begin 61 16 Chemoreceptors Transcription

Activation of various receptors in the body evoke a respiratory response.

What are the receptors called that are located in the medulla just beneath its ventral surface? The two word answer starts with CC.

  • Central chemo receptors or sometimes medullary chemo receptors.

What are chemo receptors?

  • Chemo receptors are cells that when activated result in nerve impulse.

What change activates a chemo receptor?

  • A change in chemical environment of the cell

Where are peripheral chemo receptors located?

  • The peripheral chemo receptors are located on the carotid and aortic bodies

The peripheral chemo receptors monitor what kind of blood?

  • Arterial blood

What change in either partial pressure of oxygen or hydrogen ion concentration of arterial blood evokes a response from peripheral chemo receptors?

  • An increase in either PO2 or hydrogen ion concentration of arterial blood evokes a response from the peripheral chemo receptors

A decrease in what aspect of arterial blood evokes a response?

  • A decrease in PCO2, partial pressure of carbon dioxide.

Student doctor, please pause the tape and summarize what we’ve discussed about chemo receptors.

  • Activation of various receptors in the body evoke a respiratory response. Receptors located in the medulla just beneath its ventral surface are called central chemo receptors or sometimes medullary chemo receptors. Chemo receptors are cells that when activated result in a nerve impulse. They are activated by a change in the chemical environment of the cell. The peripheral chemo receptors are located in the carotid and aortic bodies. The peripheral chemo receptors monitor arterial blood. A response from the peripheral chemo receptors is evoked by an increase in either PO2 or hydrogen ion concentration of arterial blood or by a decrease in arterial PCO2.

 

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