Distinguishing characteristics of veins include which of the following?
A. All veins carry deoxygenated blood.
B. All veins carry blood toward the heart.
C. All veins have thick, elastic walls.
D. Veins have walls consisting only of endothelial cells.
E. All veins have valves to ensure one-way movement of blood.
B
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The external intercostals elevate the rib cage during __________.
A. inspiration B. neither inspiration nor expiration C. both expiration and inspiration D. expiration
Which blood vessel tunic is innervated by nerves from the sympathetic nervous system?
A) tunica externa B) tunica intima C) tunica adventitia D) tunica media
Explain what is meant by a blood pressure reading of 120/80 mm Hg
What will be an ideal response?
The end diastolic volume is the
a. volume of blood in the atria at the end of atrial relaxation. b. volume of blood in the ventricle at the end of ventricular relaxation. c. volume of blood in the ventricle at the end of ventricular contraction. d. volume of blood in the atria at the end of atrial contraction.