The first heart sound (lub) results from the closing of the ________ valves in the beginning of ________.
A. semilunar; ventricular diastole
B. semilunar; ventricular systole
C. AV; ventricular systole
D. AV; ventricular diastole
Answer: C
You might also like to view...
What is the midlife change in estrogen and progesterone levels referred to as?
A. Menopause B. Atresia C. Menarche D. Climacteric E. Pubarche
The motor neuron pool of a skeletal muscle consists of the neurons of all of the motor units of that muscle
Indicate whether the statement is true or false.
Which depicts the order of cell formation in erythropoiesis? a: Proerythroblastb: Normoblastc: Myeloid stem celld: Reticulocytee: Erythroblastf: Mature erythrocyte
A. c, a, b, e, d, f B. a, b, c, e, d, f C. c, a, e, b, d, f D. c, b, a, d, e, f E. a, c, d, b, e, f
In myelinated axons the voltage-regulated sodium channels are concentrated at the nodes of Ranvier
Indicate whether the statement is true or false