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List the function(s) of lymph nodes. (Check all that apply.)

A.

Filter lymph

B.

Immune surveillance

C.

Produce macrophages

D.

Filter blood

Answer and Explanation

Correct Answer : A,B

A. Filter lymph:  lymph nodes physically and biologically filter lymph, trapping pathogens and debris.
B. Immune surveillance:  lymph nodes house lymphocytes and antigen-presenting cells that monitor for and respond to foreign antigens.
C. Produce macrophages: lymph nodes contain macrophages (and support their activity), but macrophages differentiate from monocytes in tissues; nodes are not typically described as producing macrophages de novo.
D. Filter blood: the spleen primarily filters blood; lymph nodes filter lymph, not systemic blood.


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Correct Answer is {"dropdown-group-1":"B"}

Explanation

Correct answer: left atrial appendage

The black leader line points to the left auricle, the ear-shaped muscular appendage of the left atrium that increases atrial volume.

Correct Answer is C

Explanation

A. An increase in parasympathetic stimulation: Parasympathetic activity lowers heart rate and typically reduces BP, so this would not increase BP.
B. A decrease in peripheral resistance: Lower peripheral resistance reduces BP (BP = CO × PR), so this would decrease BP.
C. An increase in heart rate: Raises cardiac output (if stroke volume is similar), which tends to increase blood pressure.
D. A decrease in stroke volume: Lowers cardiac output and therefore tends to decrease BP.

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