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.
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The ________ subdivides the pelvis into the "true pelvis" and the "false pelvis."
A. pelvic outlet B. pelvic inlet C. sacral promontory D. pelvic brim E. pubic symphysis
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
Single-unit smooth muscle and cardiac muscle are both self-excitable
Indicate whether the statement is true or false
Atrial contraction occurs just before
A. atrial relaxation and ventricular filling. B. isovolumetric relaxation. C. ventricular ejection. D. isovolumetric contraction.