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5 Mark Questions
(a) The cardiac cycle is controlled by the sinoatrial node (SAN) and the
atrioventricular node (AVN). Describe how.
(b) What is atheroma and how may its cause myocardial infarction?
(a) Many different substances enter and leave a cell by crossing its cell
surface membrane. Describe how substances can cross a cell surface
(b) Describe and explain how the lungs are adapted to allow rapid
exchanged of oxygen between air in the alveoli and blood in the
capillaries around the,
(a)Pulmonary tuberculosis is a disease of the lungs. Describe the
transmission and course of infection of pulmonary tuberculosis.
(b) Emphysema is another disease of the lungs. People with emphysema
may feel weak and tired. Explain why.
(a) Different cells in the body have different functions
Some white blood cells are phagocytic. Describe how these phagocyte
white blood cells destroy bacteria
(b)The epithelial cells that line the small intestine are adapted for the
absorption of glucose. Explain How.
(a) Vaccines protect people against disease. Explain how.
(b) Oral rehydration solutions (ORS) are used to treat diarrhoeal disease.
What does an ORS consist of and how does it work?
(a)The heart controls and coordinates the regular contraction of the atria and
ventricles. Describe how.
(b) The diet of a person can increase the risk of coronary heart disease.
(a) Some substances can cross the cellsurface membrane by simple
diffusion through the phospholipid bilayer. Describe other ways by
which substances cross this membrane.
(b) Atheroma formation increases a person's risk of dying. Explain How
(a) Describe how a heartbeat is initiated and coordinated.
(b) Explain how the heart muscle and the heart valves maintain a oneway
flow of blood from the left atrium to the aorta.
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(a) In humans, the enzyme maltase breaks down maltose to glucose. This
takes place at normal body temperature. Explain why maltase: Only breaks
down maltose & allows this reaction to take place at normal body
(b)Scientists have investigated the effects of competitive and
noncompetitive inhibitors of the enzyme maltase. Describe competitive and
noncompetitive inhibition of an enzyme.…read more