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How is blood pumped by the heart?

There are 3 main phases in the cardiac cycle: Diastole, Atrial systole, Ventricular systole 1.Diastole: -The heart fills with blood as the atria and ventricles relax. -Blood flows from the major veins(vena c...
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Answered by Victoria L. • Biology tutor
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What are the distinguishing features of a mammal compared to other classes of animals?

All classes of vertebrates have their own distinguishing features that we can use to identify if an animal is indeed a mammal or not. The main classes of vertebrates can be simpified into mammals, fish, amph...
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Answered by Jamal A. • Biology tutor
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1. Describe how different parts of the human digestive system help to break down molecules of fat so that they can be absorbed into the body.

Fat is first processed by mechanical breakdown in the mouth through chewing and in the stomach through its ‘churning’ action. Lipase, an enzyme produced in the pancreas, converts fat in the small intestine i...
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Answered by Ruby L. • Biology tutor
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Explain the oxygen dissociation curve and the role of Bohr shift.

(1) Oxygen is transported around the body in red blood cells. In the red blood cell it is bound to a protein called haemoglobin. Oxygen dissociation curves show the relationship between oxygen levels (as par...
MC
Answered by Matthew C. • Biology tutor
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What are the functions of white blood cells?

The main role of white blood cells is to protect the body against invasion by disease-causing microorganisms (pathogens), such as bacteria or viruses. They do this in 2 main ways: phagocytosis and antibody p...
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Answered by Neha K. • Biology tutor
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