1. Does a single axon interact with just one muscle cell, or with more than one?

Question

1. Does a single axon interact with just one muscle cell, or with more than one?

2. Are muscle cells controlled individually, or in groups? Explain.

3. Knowing what the pituitary gland does, what might happen if you had a tumor that was disrupting the gland's function?

4. Which light-sensitive cells (rods or cones) are better at providing vision in very low light conditions? What makes them able to do this?

5. Which light sensitive cells (rods or cones) are able to provide better resolution and color information, but only work well during periods of sufficient lighting? What makes them able to do this?

Explanation / Answer

Question 1

Answer

The single axon interacts with more than one muscle cell because the axon divided into the number of branches and they interact with many muscle cells. It also depends on the type of muscle.

Question 2

Answer

The muscle cells are controlled by groups.The activity of muscle is controlled by neuron. The one muscle consists of the number of muscle cells. so impossible to control each muscle cell. each nerve controls a group of muscle cells. so muscle is controlled by the group.

Question 3

Answer

The tumors in the pituitary gland influence the functions by hyposecretion of hormones are hypersecretion of hormones.

Here, have two types of tumor cells

i. secretory tumor cells -secretes more hormone

ii. non-secretory tumor cells - no secretion of the hormone.

both hypo and hypersecretion of hormones lead to abnormal functions of the pituitary gland.

pituitary hormones are prolactin, growth hormone, luteinizing hormone, follicle stimulating hormone, thyroid stimulating hormone.

Question 4

Answer

The photosensitive Rods can provide the vision in the very low light conditions. The rods have very sensitive light detector cell they can detect low illuminations and have color vision also. During night or in dim light, the ciliary muscle contraction and relaxation provide dilation and constriction pupil.pupil send the light to retinas.

In the dim light, ciliary muscle contraction causes dilation of the pupil and more light is entered into the retina and provide vision dim light.

Question 5

Answer Cones

The photosensitive cones provide vision only in bright light. and don't have color vision. during daytime or in bright light, Contraction circular muscle cause constriction of pupils and less or sufficient light is entered cones and provide vision.

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