Describe the factors that affect chemical reaction rates.

What will be an ideal response?


Temperature increases kinetic energy and therefore the force of molecular collisions. Particle size: smaller particles move faster at the same temperature and therefore collide more frequently; also, smaller particles have more surface area given the same concentration of reactants. Concentration: the higher the concentration, the greater the chance of particles colliding. Catalysts increase the rate of the reaction at a given temperature. Enzymes are biological catalysts.

Anatomy & Physiology

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The ________ subdivides the pelvis into the "true pelvis" and the "false pelvis."

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Atrial contraction occurs just before

A. atrial relaxation and ventricular filling. B. isovolumetric relaxation. C. ventricular ejection. D. isovolumetric contraction.

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Single-unit smooth muscle and cardiac muscle are both self-excitable

Indicate whether the statement is true or false

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During implantation, the trophoblast divides into a superficial layer called the __________, which is composed of a multinucleate mass of cytoplasm.

A. chorion B. embryoblast C. amnion D. syncytiotrophoblast E. cytotrophoblast

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