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Dafna11 [192]
3 years ago
14

Name and describe two infectious viruses and a body’s first defense against infections

Biology
1 answer:
anzhelika [568]3 years ago
4 0

Rhinoviruses and herpes simplex are just two common viruses out of the other thousands of them that the immune system has to protect the body against.

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The Himalaya mountains formed from the collision of the India plate and Eurasian plate each carrying continental crust. what typ
marissa [1.9K]

Answer:

Fold Mountains

Explanation:

"The rugged, soaring heights of the Himalayas, Andes, and Alps are all active fold mountains." - google

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3 years ago
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The autorhythmicity of cardiac pacemaker cells is made possible by the reduced permeability of _______. The autorhythmicity of c
vichka [17]

Answer:

<h2>potassium</h2>

Explanation:

The heartbeats of the heart are controlled by the sinoatrial node also known as the pacemaker of the heart. The impulse is generated in the conducting cells of the pacemaker as a result of the movement of sodium, potassium and calcium ions.

The sodium channels allow the movement of sodium into the cell which depolarizes the membrane from -60mv to -40 mv. At this point, the calcium gated channels open which allow the entry of the calcium in the cell which depolarizes the cell up to +5mv.

At this point, the potassium channels open which allows the potassium ions to move out of the cell. This repolarizes the cell and hence the cycle again begins.  Reducing the permeability of the potassium ions help generate the autorhythmicity due to repolarization and thus is the correct answer.

7 0
4 years ago
Which came first: land plants or dinosaurs?
Scorpion4ik [409]

Answer:

Bacteria, but out of those three then it would be land, because animals (dinosaurs) Could not live without food (plants) and plants can't grow without land.

Explanation:

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3 years ago
B) Why are index fossils helpful for performing relative dating? (3 points)
uysha [10]

Answer:

4.) This means that height in a rat is controlled by many different genes.

Explanation:

6 0
3 years ago
A portion of a field has drained more rapidly than the rest, leading to drought conditions in that area several days before the
Andrew [12]

Answer:

Due to sloppy nature of the field.

Explanation:

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3 0
3 years ago
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