State the function of platelets in response to a skin cut.

Describe the pathway of the electrical impulse during excitation of the heart muscle.

platelets help form a clot / scab at the site of the cut;

pacemaker/SA node fires initiate electrical impulse;

impulse travels across the atria walls;

impulse arrives at the AV node <base of the right atrium>;

impulse passes from the AV node down to the bundle of His <through the septum>;

passes down the <left and right> bundle branches <to the apex of the heart>;

travels up through the Purkinje fibres <to stimulate the rest of the ventricles>;

Accept an annotated diagram.
Responses must be in chronological order to be credited, not just a list.

Generally answered correctly.

Generally answered correctly to obtain at least 2 or 3 marks.