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Describe and explain how blood in the right ventricle travels to the left atrium in the heart

Deoxygenated blood flows from the right ventricle to the lungs via the pulmonary artery. The contraction of the right ventricle increases the pressure within it so that it is greater than in the pulmonary ar...
SM
Answered by Sara M. • Biology tutor
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Describe the similarities and differences between haemoglobin and collagen.

Similarities:Both have a quaternary structure (consisting of more than one polypeptide).Both are found in animals (haemoglobin is found in blood and collagen is found in the muscles, skin, bones and tendons)...
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Answered by Shannon M. • Biology tutor
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Describe how a sperm cell is adapted for it's function. (4 marks)

1 mark each for one of the following: Describe the sperm cell's function; i.e. fertilising the egg (Proportionally large) flagellum for mobility Possess an Acrosome filled with enzymes to pass through the eg...
JM
Answered by Jack M. • Biology tutor
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Explain how the cardiac muscle controls the regular beating of the heart.

Cardiac muscle is myogenic. This means signals for contraction and relaxation originate from the heart itself. The process is initiated in the sinoatrial node (SAN), located in the right atrium. The SAN is a...
CJ
Answered by Christie J. • Biology tutor
4188 Views

Explain the transmission of a nerve impulse across a cholinergic synapse referring to action potentials. (6)

When an action potential reaches the terminal of a pre-synaptic cleft, voltage-gated calcium channels are stimulated to open, causing an influx of Ca+ ions in the pre-synaptic neuron. This infux of Ca+ ions ...
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Answered by Sarah W. • Biology tutor
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