Secondary immune responses upon a second exposure to a pathogen are due to the activation of antigen or virus that cause disease.
<h3>What is secondary immune exposure?</h3>
A second exposure to the antigen that was in the vaccine, or to the pathogen that make the person ill. Due to this causes the white blood cells to respond much more quickly so this is type of response is known as secondary immune response.
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I think the doctor noticed how he was breathing in the last two days as it has gotten worse and tested him out. He can exercise, drink lots of water, eat healthier, have plenty of rest and don’t go near things that he is allergic to.
Answer:
The answer is B: All the muscle cells innervated by a single motor neurorn.
Explanation:
It is called a motor unit, all muscle fibers that are innervated by a motor neuron cell. A motor neuron cell can establish contact with up to 150 muscle fibrils, which when activated causes their simultaneous contraction, therefore, all the muscle fibers of a motor unit contract and relax at the same time.
