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oksian1 [2.3K]
3 years ago
12

How many stem cells are there? name them all.

Biology
1 answer:
SashulF [63]3 years ago
7 0
There are 5 stem cells. Totipotent Stem Cell, Pluripotent Stem Cell, Multipotent Stem Cell, Oligopotent Stem Cell, and Unipotent Stem Cell.
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What is the function of the nervous system? What is the basic unit of the nervous system?
Sidana [21]

Answer:

Illustration of the architecture of a neuron, including the cell body, nucleus, dendrites, axon, myelin sheath, node of Ranvier, synapses, and axon terminal. ( the photo with the answer )  

The nervous system has two main parts:

The central nervous system is made up of the brain and spinal cord.

The peripheral nervous system is made up of nerves that branch off from the spinal cord and extend to all parts of the body.

The nervous system transmits signals between the brain and the rest of the body, including internal organs. In this way, the nervous system’s activity controls the ability to move, breathe, see, think, and more.

The basic unit of the nervous system is a nerve cell, or neuron. The human brain contains about 100 billion neurons. A neuron has a cell body, which includes the cell nucleus, and special extensions called axons and dendrites. Bundles of axons, called nerves, are found throughout the body. Axons and dendrites allow neurons to communicate, even across long distances.

Different types of neurons control or perform different activities. For instance, motor neurons transmit messages from the brain to the muscles to generate movement. Sensory neurons detect light, sound, odor, taste, pressure, and heat and send messages about those things to the brain. Other parts of the nervous system control involuntary processes. These include keeping a regular heartbeat, releasing hormones like adrenaline, opening the pupil in response to light, and regulating the digestive system.

When a neuron sends a message to another neuron, it sends an electrical signal down the length of its axon. At the end of the axon, the electrical signal changes to a chemical signal. The axon then releases the chemical signal with chemical messengers called neurotransmitters into the synapse     the space between the end of an axon and the tip of a dendrite from another neuron. The neurotransmitters move the signal through the synapse to the neighboring dendrite, which converts the chemical signal back into an electrical signal. The electrical signal then travels through the neuron and goes through the same conversion processes as it moves to neighboring neurons.

The nervous system also includes non-neuron cells, called glia . Glia perform many important functions that keep the nervous system working properly. For example, glia:

1-  Help support and hold neurons in place

2- Protect neurons

3- Create insulation called myelin, which helps move nerve impulses

4- Repair neurons and help restore neuron function

5- Trim out dead neurons

6- Regulate neurotransmitters

The brain is made up of many networks of communicating neurons and glia. These networks allow different parts of the brain to “talk” to each other and work together to control body functions, emotions, thinking, behavior, and other activities.

Explanation:

5 0
3 years ago
Read 2 more answers
Temperature is constant in the bathypelagic zone.<br> A. True<br> B. False
Lilit [14]
Answer

True

Explanation:

The temperature in the bathypelagic zone, unlike that of the mesopelagic zone, is constant.
8 0
2 years ago
Which statement best describes the process by which the millions of body cells that form a housefly can all contain the same gen
Brut [27]
DNA replication?
Mitosis?
5 0
3 years ago
3.Commercial development in the U.S. has resulted in an increase in the number of roads, housing developments, shopping centers,
Art [367]

The correct answer is option A, that is, development often causes habitat fragmentation, which can threaten biodiversity.

Fragmentation is usually illustrated as a reduction in some of all the kinds of natural habitats in a landscape, and the differentiation of a landscape into smaller and more isolated segments. With the development of the fragmentation process, the ecological influences will modify.  

Fragmentation can be a result of natural procedures like floods, fires, and volcanic activity, but it is more generally caused due to human activities like an increase in the number of roads, housing developments, shopping centers, and parking lots.  

With the enhancement in human activities, the effect of fragmentation become more. Eventually, it results in the devastating influences on the local species, a complete modification to the landscape, and the loss of the region's wilderness heritage.  


3 0
3 years ago
READING TOOL Sequence of Events As you read your textbook, identify the sequence of
schepotkina [342]

Mendel observed phenotypic traits during the cross of pea plants. Subsequently, he noted each trait had only two forms.

<h3>Mendel's Experiments</h3>

Mendel crossed pure-breeding pea plants, and then he crossed hybrid generations, as well crossed the hybrid progeny back to parental lines.

From these crosses, Mendel observed the descendence and then formulated a series of inheritance principles.

Mendel noted traits can be divided into dominant and recessive phenotypic characteristics.

Dominant characteristics were inherited in an unaltered manner after hybridization of true breeding [plants.

Learn more about Mendel's experiments here:

brainly.com/question/9546178

3 0
2 years ago
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