Answer:
Explanation:
The ER membrane is similar in structure to the plasma membrane. There are two types of ER rough endoplasmic reticulum (RER) and smooth endoplasmic reticulum (SER).There are some protiens and lipids which help in the building of cell membrane is called membrane biogenesis
The fist one is (a) and the send is (d)
Answer:
The correct answer is c) action potential
Explanation:
Action potential starts with the opening of the sodium channel in response to the stimulus given to the neuron by neurotransmitter. This opening of sodium ion channel results in the influx of sodium ions in the receptive region of neurons from outside. This is the depolarization step of action potential.
Before this step, the neurons are negatively charged from inside and positively charge outside and this stage it is considered to be resting stage.
As the amount of Na⁺ reaches the threshold value the action potential fires and send the electric signals down to axons.
Therefore action potential occurs because of the influx of Na⁺ ions through chemically gated channels in the receptive region of a neuron.
The oxygen atom of H2O has a negative charge.
Echinoderm is the name given to a member of the phylum Echinodermata. They have radial symmetry and this includes sea urchins, sand dollars, sea stars and sea cucumbers. It is suggested that they are related to the chordates which is the answer.