What is a role of the pacemaker or sinoatrial node (SAN) ?

A. To initiate contraction of the ventricle

B. To pass the excitation through Purkinje fibres

C. To originate excitation in myogenic muscle

D. To cause the relaxation of the atria

Heredity has no impact on personal health, but enviomental factors are important as well true for false

Which property of oceans best explains why they have a major effect on climate? A. They hold a large amount of heat energy. B. They have a constant tidal movement. C. They absorb gases from the atmosphere. D.

Why is the increase in atmospheric carbon dioxide dangerous? A) The gas inhibits the escape of heat from Earth's atmosphere. B) Carbon dioxide inhibits rainfall causing long droughts. C) The gas prevents plants from photosynthesizing.

What happens to a lizard's metabolic rate when the temperature increases 10°c? what happens to a lizard's metabolic rate when the temperature increases 10°c? the metabolic rate approximately quadruples. the metabolic rate approximately doubles.

Triglycerides are the most common lipid found in foods. triglycerides are the most common lipid found in foods. a. True b. False

What happens during anaphase

What would happen if both male and female passed on their whole genes?

Calculate the distance penny rides her bicycle. if she rides 1/4 mile each day for 11 days.

An area of land that is covered with a shallow layer of water during some or all of the year is called

What is the role of the atp in the cell