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ziro4ka [17]
4 years ago
12

I which part of the cell concerned with the entry of only certain substances into and out of the cell.

Biology
1 answer:
elena55 [62]4 years ago
3 0

cell membrane is the answer to this question

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A boxer has been jumping rope for an hour. His leg muscles are burning, and he feels weak. Which substance is the most likely ca
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The lactic acid that is building up in his muscles will eventually cause him to stop exercising. The burning sensation comes from the build up of that lactic acid in his muscles.

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What is the name of the solid part of Earth, including rock, minerals, and metals?
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Lithosphere is the name of the solid part of Earth, including rock, minerals, and metals.

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What do babies hear and feel inside the mother's womb?
Bogdan [553]
Well, they feel the womb and hear the outside. that's about it other than making the baby.
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The primary function of the glial cells is to:_______.
Mkey [24]

Answer:

The correct answer is d. provide structural support and nutrition to the neuron.

Explanation:

Glial cells are the cells that surround the neurons and provide structural support to them. They also help in insulation for neurons. They are the most abundant cells present in the nervous system.  

Many glial cell plays a role in providing nutrition and oxygen to the neurons and regulation of extracellular brain fluid. Glial cells also helps in cleaning up the dead neurons.  

The different types of glial cells are ependymal cells, schwann cells, microglia, oligodendrocytes, astrocytes, and satellite cells. So the right answer is d.

4 0
3 years ago
Sound waves travel through gas liquid and solids A) True B) False
Novay_Z [31]

Answer:

True.

Explanation:

  • Sound is a form of Energy that produces a sensation of hearing in our ears.
  • Sound is produced as a result of vibration produced in a body.
  • Sound energy is transmitted from one place o other place by wave motion.
  • When a body vibrates, the particles of medium surrounding it starts vibrating about their mean position.
  • During vibration, they collide with the surrounding particle and transfer some energy to them.
  • They then start vibrating faster and transferring  energy to the next surrounding particle. This process continues till the vibration reaches a person ear.
  • Thus, particles are an important factor in propagation of sound.
  • Sound cannot travel in vacuum.
  • It requires a medium to travel from one point to another.
  • A sound can travel in all medium, solids, liquids and gases as all of these have particles.
  • The speed of sound is highest in solids and lowest in gases as the inter molecular space is largest in gases and smallest  in solids.
4 0
3 years ago
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