Question

question 16
1 pts
the free edges of the atrioventricular valves are anchored to the
ventricles.
atria.
papillary muscles.
pericardia.
question 17
1 pts
a decrease in the amount of white blood cells is called
leukocytosis.
leukopenia.
differential white blood cell count.
hemostasis.
question 18
1 pts
the ____ is(are) supplied with blood from the left subclavian artery.
spinal cord and brain
fingers
head and upper extremities
lower torso

Explanation:

Question 16

The atrioventricular valves (tricuspid and mitral/bicuspid) have chordae tendineae. These chordae tendineae are attached to papillary muscles in the ventricles. The papillary muscles contract to prevent the valves from inverting (prolapsing) into the atria when the ventricles contract. Ventricles are the chambers, atria are the upper chambers, and pericardia is the sac around the heart.

Leukocytosis is an increase in white - blood cells (often due to infection). A differential white - blood cell count is a test to count different types of white - blood cells. Hemostasis is the process of stopping bleeding. Leukopenia specifically refers to a decrease in the number of white - blood cells.

The left subclavian artery branches off the aortic arch (in systemic circulation). It gives rise to arteries that supply the head (through branches like the vertebral artery which can contribute to brain supply in part) and the upper extremities (like the axillary artery which further branches to supply the arm, forearm, and hand). The spinal cord has its own arterial supply (anterior and posterior spinal arteries), fingers are a part of the upper extremities but the option "head and upper extremities" is more comprehensive. The lower torso is supplied by different arteries (e.g., from the abdominal aorta).

Answer:

papillary muscles.

Question 17