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grin007 [14]
2 years ago
5

How is the structure of a nerve cell specialised to carry out its functions​

Biology
1 answer:
zvonat [6]2 years ago
6 0

Answer:

A typical neuron consists of a cell body (soma), dendrites, and a single axon. The soma is usually compact. The axon and dendrites are filaments that extrude from it. Dendrites typically branch profusely and extend a few hundred micrometers from the soma. The axon leaves the soma at a swelling called the axon hillock (<em><u>the axon hillock also has the greatest density of voltage-dependent sodium channels. This makes it the most easily excited part of the neuron and the spike initiation zone for the axon</u></em>) and it branches but usually maintains a constant diameter. At the farthest tip of the axon's branches are axon terminals, where the neuron can transmit a signal across the synapse to another cell.

<em>In general, dendrites receive the electrical signal from other neurons, and this signal is transmitted over long distances from the axon.</em>

Like all animal cells, the cell body of every neuron is enclosed by a plasma membrane, a bilayer of lipid molecules with many types of protein structures embedded in it. A lipid bilayer is a powerful electrical insulator, but in neurons, many of the protein structures embedded in the membrane are electrically active. These include ion channels that permit electrically charged ions to flow across the membrane and ion pumps that chemically transport ions from one side of the membrane to the other to generate the action potential that generates the electrical signal. They also have a highly developed synthetic apparatus for the production of neurotransmitters

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The signal for apoptosis can come from outside or inside the cell. Give one example when the signal comes from outside the cell
Svetach [21]

Answer:

- A signal for apoptosis that comes from outside the cell is when a cell detaches from extracellular matrix. If this happens, a transmembrane signal is triggered.

- Two examples of cellular occurrences that would prompt an apoptosis signal from inside the cell are:

1. Damaged DNA

2. Increase of cytosolic calcium concentration

Explanation:

Apoptosis can be activated from an intrinsic or an extrinsic pathway. The intrinsic pathway is activated when a cell senses stress (for example, damaged DNA or high cytosolic calcium concentration) and triggers death proteins to activate apoptosis mechanism inside of it; the extrinsic pathway refers to the apoptosis triggered by signals that come from other cells. In this scenario, ligands bind to cell-surface death receptors and activates a death-inducing signal.

5 0
3 years ago
Plants are a source of ________.<br><br> food<br> fuel<br> medicine<br> all of the above
den301095 [7]

Answer:

Plants are a source of food, fuel and medicine.

Explanation:

In biology, plants are photosynthetic living beings without locomotive capacity whose cell walls are mainly composed of cellulose.

The importance of plants for humans is indisputable. Without them we could not live, since the plants participated in the composition of the gases present in the Earth's atmosphere and in the ecosystems, and are the primary source of food for heterotrophic organisms. In addition, plants have direct importance to man: as a source of food; as building materials, firewood, fuel and paper; as ornamental; as substances that worsen or improve health and therefore have medical importance; and as a consequence of the latter, as the raw material of the pharmaceutical industry.

7 0
3 years ago
What's the importance of radioactive isotopes in determining the age of earth?
PilotLPTM [1.2K]
Thye can find ages or how long is been there for rocks
5 0
3 years ago
Tunnels formed by new bone deposition are lined by
Gnoma [55]
I belive its called Endosteum.
6 0
3 years ago
In cabbage butterflies, White wings are dominant to yellow wings. Create a Punnett Square that shows the offspring that results
ioda

Answer:

1. 50%

2. ½ for both Ww and ww

Explanation:

White wings: WW, Ww

Yellow wings: ww

Ww x ww

White wing: W w

Yellow wing: w Ww ww

w Ww ww

Phenotypic ratio: Ww: ½ ww: ½

Percentage of offspring with yellow wings is 50%

5 0
3 years ago
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