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Describe the ways in which the pancreas acts as both an endocrine and exocrine gland

The Endocrine part of the Pancreas is the Islets of Langerhans which contain alpha and beta cells. These cells secrete hormones directly into the blood. The alpha cells secrete glucagon and the beta cells se...
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Answered by Esther S. • Biology tutor
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Explain the way in which blood moves throughout the heart, including nodes and valves.

First, the blood enters through the right and left atria. The atrioventricular valves are closed, so the blood pools up inside them. Then, the sinoatrial node (SAN) sends a pulse for the atria to contract, f...
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Answered by Nicole R. • Biology tutor
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Explain how chemical transfer across a synapse occurs.

The nerve impulse will reach the end of the presynaptic neuron, where voltage-gated calcium channels are opened due to depolarisation. Calcium ions then diffuse into the presynaptic neuron, resulting in vesi...
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Answered by Olivia S. • Biology tutor
2249 Views

Suggest why an increase in phosphate can be linked to embryonic growth.

Embryonic growth requires cell division and the subsequent synthesis of new tissue. This invariably requires energy and raw materials to progress. Phosphate is an important component of ATP, which acts as a ...
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Answered by Vinit V. • Biology tutor
9758 Views

How does osmosis work?

Osmosis can be explained as the passing of water molecules across a partially permeable membrane from an area of high concentration of water molecules to an area of low concentration of water molecules.If wa...
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Answered by Grace W. • Biology tutor
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