Select the correct statement about diffusion
a. it depends on the random motion
b. it involves active forces.
c. its rate increases as the temperature decreases.
d. molecules move from a lower concentration to a higher concentration.
e. the chemical gradient of a substance does not affect it.
A
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The lungs lie in the ________ cavity
A) dorsal B) mediastinum C) pleural D) pericardial
An inactivated ion channel will respond to a stronger than normal threshold stimulus.
Answer the following statement true (T) or false (F)
Which of the following statements about the cardiac cycle is TRUE?
A. The duration of systole is greater than that of diastole in a subject at rest. B. During isovolumetric ventricular relaxation, blood flows from the atria into the ventricles. C. Closure of the atrioventricular valves occurs at the onset of ventricular systole. D. The QRS complex occurs at approximately the same time as the closure of the semilunar valves. E. The first valves to go from closed to open after the atrial kick are the atrioventricular valves.
Which term describes the prompt constriction of a broken vessel?
A. Platelet plug formation B. Coagulation C. Vascular spasm D. None of these answers are correct.