Give reasons for the following:
1. Neurons are often long and wire
2.Alveoli in lungs have thin member
3.Plasma membrane plays an impon
role in generating immune respon
4. Nucleus occupies a peripheral post
in mature plant cells.
Answers
Answer:
1.The dendrites of a neuron are thin, branching projections that receives the neurotransmitters and creates a change in voltage in the cell. The axons on the other hand are long projections whose function is to carry the action potential away from the cell body toward the next neuron.
2.Each alveolus is cup-shaped with very thin walls. It's surrounded by networks of blood vessels called capillaries that also have thin walls. The oxygen you breathe in diffuses through the alveoli and the capillaries into the blood.
3 .because it is the outer most covering of cell. the plasma membrane allow enter or exit of materials in cell
4.Due to plant of large vacuole in mature plant cell the nucleus occupies the peripheral position.
☆A large vacuole is present occupies the half of the space of the cell and hence pushing the nucleus towards the corner of the cell.