2 years ago

What are the physiological barriers in our immune system

2 answers:

7 0

Anatomical and physiological barriers provide the crucial first line of defense against pathogens. These barriers include intact skin, vigorous mucociliary clearance mechanisms, low stomach pH and bacteriolytic lysozyme in tears, saliva and other secretions.

Blababa [14]2 years ago

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2 years ago

Pacemaker cells in the heart possess intrinsic rhythm. <br> a. True<br> b. False

Sveta_85 [38]

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True

Explanation:

Pacemaker cells, unlike other neurons in the body, can depolarized themselves (and therefore can fire action potentials) without the need of an external innervation of the autonomic nervous system.

Each class of pacemaker cells has its own intrinsic rate.

For example, sinoatrial node rate is 60-100 bpm (the normal heart frequency).

The atrioventricular node is also part of the electrical conduction system of the heart. When the sinoatrial node fails, atrioventricular node takes the lead (40-60 bpm).

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matrenka [14]

Answer: hemostasis

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