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Give two examples of physical or chemical barriers of defence against pathogens found inhumans.

Skin, mucosal lining, stomach acid
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Explain how an action potential is propagated across a synapse in a muscles (3 marks)

Any three of the following, in the correct order. Action potential arrives at the pre-synaptic membrane Causes the voltage gated Ca2+ channels in the pre synaptic terminal to openCa2+ enters the pre synaptic...
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Compare anaerobic respiration in a yeast cell with anaerobic respiration in a muscle cell (3 marks)

READ the question - Anaerobic respiration in both 3 marks = give 3 differences/similaritiesyeast produces ethanol but muscles produce lactic acid (difference 1)yeast produces CO2 but muscles do not (MUST mak...
AS
Answered by Amy S. • Biology tutor
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What is glucose homeostasis in a human?

Homeostasis describes the maintenance of the body’s internal environment. Glucose homeostasis is specifically referring to the control of the levels of sugar in the blood. The pancreas is an organ, which rel...
FP
Answered by Francesca P. • Biology tutor
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Describe the process of carbohydrate digestion.

Mastication breaks down food into smaller chunks increasing the surface area for digestive enzymes to work on, and making it easier to swallow the food. The salivary gland secretes amylase which hydrolyses s...
EK
Answered by Ela K. • Biology tutor
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