Question

question 94
0.25 pts
the brachiocephalic vein drains blood from the
right posterior wall of the thorax and abdomen.
head, neck, and upper extremity.
kidneys.
lower trunk and extremity.
question 95
0.25 pts
the outermost layer of the larger blood vessels is the tunica
media.
intima.
adventitia.
intermedia.
question 96
0.25 pts
mechanical devices that permit the flow of blood in one direction only are called
ventricles.
atria.
valves.
vessels.

Explanation:

Question 94

The brachiocephalic vein (formed by the union of the internal jugular and subclavian veins) drains blood from the head, neck, and upper extremity. The right posterior wall of the thorax and abdomen is drained by the azygos vein, kidneys by renal veins, and lower trunk/extremity by the inferior vena cava.

Larger blood vessels (arteries and veins) have three layers: tunica intima (innermost), tunica media (middle, muscular), and tunica adventitia (outermost, connective tissue). Tunica intermedia is not a standard layer.

Valves (in veins and heart) are mechanical devices that allow blood to flow in only one direction, preventing backflow. Ventricles and atria are heart chambers, and vessels are the conduits (arteries, veins, capillaries) but not the one - way flow regulators.

Answer:

B. head, neck, and upper extremity.

Question 95