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3 years ago

Which of the following is not microscopic description of neurons:

Biology

2 answers:

AysviL [449]3 years ago

7 0

Answer:

Star-shaped.

Explanation:

Neurons are the nerve cell that acts as the basic structural unit of the nervous system. Neurons helps in the transmission of nerve impulse and transmit the signal into different parts of the body.

There are basically four types of microscopic neuron : unipolar, bipolar, multipolar and pseuounipolar neuron. Star-shaped neurons are not found in the microscopic description of neuron.

Thus, the correct answer is option (a).

Rina8888 [55]3 years ago

6 0

Answer:

Star-shaped

Explanation:

Nervous cells in our body are capable of generating, receiving, and sending electrical signals to different cells. It establishes a communicating system in our body apart from the endocrine system. Its function is very first. The units of the nervous system are the neurons. The neurons are 3 types according to their structure- multipolar neuron, bipolar neuron, and unipolar/ pseudounipolar neurons. The multipolar neurons have one cyton, one axon having many branching dendrites. These types of neurons are common and found in the brain.

The bipolar neurons have one cell body and one axon having one dendron. The bipolar neurons are found in the retina of the eye.

The unipolar or pseudounipolar neurons are bipolar during the embryonic stage and later it becomes unipolar neurons. It contains one axon which arises from cyton. The axon bifurcates to form the axon at one end and dendrites at the other end. This type of neurons is found in the dorsal root ganglia of the spinal cord.

Besides the neurons, another type of nerve cells is present in the nervous system known as glial cells. It is the support system of the nervous system and increases the efficiency of the neurons. They are also different types - astrocytes, oligodendrocytes, microglia, and satellite cells. The astrocytes are star-shaped nerve cells. It connects neurons and blood vessels.

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why do the three species have similarities and differences in their body structures, and how can Xiao use the structures to dete

Luba_88 [7]

Answer:

Xiao can use these structures to create a similarity matrix that enables to differentiate between synapomorphies and homoplasies .

Explanation:

A synapomorphy is a trait that has been inherited from the same ancestor, this trait enables to establish a relation of homology between two or more species; while a homoplasy is an analog structure that doesn't have homology.

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3 years ago

What are the phases of mitosis and meiosis and what do they do?

ehidna [41]

Prophase
Metaphase
Anaphase
Telophase

Meiosis is the process of cell division by which involving gametes. Cell division is just the same for sperm and egg cells, but they have distinguishable descriptions and labels in the process. Spermatogenesis is for the males’ sperm cells and oogenesis is the process for females’ egg cells. The cell division of meiosis involves the two phases, respectively meiosis I and meiosis II. Meiosis I like mitosis is the cell division that produces diploid cells<span>. These diploid cells are cells that contain a complete pair of chromosomes which is 46. The result is two diploid cells after the first meiosis. To provide clear explanation, in contrast haploid cells only contain 23 chromosomes and are created after meiosis II which is 4 in number. </span>

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3 years ago

Matings between individuals from the two populations of Rhagoletis produce hybrid flies that appear to be healthy and have norma

Mama L [17]

<h2>The correct answer is : C.</h2>

Explanation:

According to the question, mating between two populations of Rhagoletis produce hybrid flies.
This means that the two population is present in the same habitat or locality, hence they are capable of coming in contact with each other and mate. Hence, the answer cannot be Habitat Isolation.
Mating produces hybrid flies. This is possible when the gametes (egg and sperm) of the two different populations are capable of capable of coming close to each other and undergoing fusion (fertilization). Hence, there is no Mechanical Isolation.
The zygote formed by the above fertilization is capable of developing into healthy hybrid flies with normal life span. Hence, Pre-zygotic Isolation is absent.
But the hybrid flies formed are sterile and not fertile, that is, they are incapable of producing viable gametes which can undergo fertilization and produce a new offspring.Therefore, the eggs laid by the hybrid flies hatch less often. Hence, there is existence of Reduced hybrid fertility.

8 0

3 years ago

by the time jefferson was reelected for a second term foreign relations with france and britain were A. Strong B. Resolved C. St

ivolga24 [154]

Answer: C. Strained

Explanation:

The diplomatic neutrality of the United States was tested during the Napoleonic Wars . The warring nations of Britain and France both imposed trade restrictions in order to weaken each other's economies. These restrictions also disrupted American trade and threatened American neutrality.

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2 years ago

Name each structure

dusya [7]

Answer:

The organ is the female reproductive organ , the uterus

and the green arrow points to the cervix

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2 years ago