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Explain how an action potential is transmitted across a cholinergic synapse.

The action potential arrives at the synaptic knob of the presynaptic neurone. The action potential stimulates the opening of voltage-gated calcium ion channels in the presynaptic neurone, allowing calcium io...
KE
Answered by Kathryn E. • Biology tutor
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Describe how a sperm cell is adapted to its role

Contains enzymes to digest egg cell wallFull of mitochondria to supply energy for movementtail for swimming Sperm contains generic material to transfer to the egg
RJ
Answered by Rachelle J. • Biology tutor
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How does the body respond to a decrease or increase in core body temperature?

If the temperature decreases:The blood vessels supplying the skin constrict (vasoconstriction) resulting in less blood flow to the skin surface and hence less energy (by heat) is lost. Hairs stand on end to ...
PJ
Answered by Portia J. • Biology tutor
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The pancrease secretes protease enzymes. How do organelles within a cell work together to PRODUCE and RELEASE these protein molecules from the cell?

The nucleus contains the gene that codes for the enzyme and is where transcription happens to produce mRNA . The mRNA leaves the nucleus and attaches to a ribosome on the rough endoplasmic reticulum. The rib...
JE
Answered by Jessica E. • Biology tutor
15414 Views

Describe how phagocytosis of a virus leads to presentation of its antigens and how presentation of this antigen leads to the secretion of an antibody against this virus antigen.

The macrophage engulfs the virus and the phagosome fuses with a lysosome, the virus is then broken down by hydrolytic enzymes inside the lysosome, and virus' antigens are displayed on the cell surface membra...
OR
Answered by Oenone R. • Biology tutor
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