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LenaWriter [7]
3 years ago
13

When does the nervous system begin to form?

Biology
1 answer:
djverab [1.8K]3 years ago
3 0
The human nervous system starts to form very early in the embryo’s development. At the end of the gastrulation phase, an elongated structure, the notochord, is laid down. The embryo thereby changes from a circular organization to an axial one—a critical step in the development of its nervous system.
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Axons are classified into three major groups called A, B, and C, based on their ____________ . Group A has a conduction velocity
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Answer:

1. Based on their physical features and conduction properties

2. 80m/s to 120m/s

3. Has both sensory fibers and motor fibers

4. Group B conduct at 3m/s to 15m/s

5. Group C conduct at 0.5m/s to 15m/s

6. They generally have low conduction velocity and are polymodal

Explanation:

Axons were know to have different thickness and this differences were thought to relate to the speed at which the action potential could travel. This hypothesis was proved by Erlanger and Gasser.

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Plant and animal cells differ in a variety of ways. Plants have a special structure that helps them produce their own food. With
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Beetroot cells contain a family of dark red pigments called betalains. The selectively permeable nature of the beetroot cells ke
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Answer:

B. When beetroot cells are placed in a solution with cellulase, the solution remains clear.

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List three advantages of managed care organizations
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Answer:

True

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