Just prior to atrial contraction,

A.  all four chambers are at rest and AV valves are open.
B.  all four chambers are at rest and AV valves are closed.
C.  all four chambers are contracting and all valves are open.
D.  both ventricles are contracting and blood is being ejected into the major arteries.
E.  both atria are contracting and blood is being ejected into the major arteries.


A

Anatomy & Physiology

You might also like to view...

After sperm are produced, they enter the first part of the duct system, the:

a.) ductus deferens

b.) ejaculatory duct

c.) epididymis

d.) urethra

Anatomy & Physiology

Functionally, neurons within the CNS that receive, process, store, and retrieve information are referred to as __________.

Fill in the blank(s) with the appropriate word(s).

Anatomy & Physiology

Which of the following are involved in the initiation step of translation? select all that apply.

a) mRNA b) DNA c) RNA polymerase d) ribosomal subunits e) methionine f) initiator tRNA

Anatomy & Physiology

How many spinal nerves attach to the spinal cord between vertebrae?

A. 12 B. 14 C. 30 D. 31

Anatomy & Physiology