A cell has engulfed a substance from the extracellular material and has migrated to a lymph node to interact with a helper T cell. Which of the following statements best describes this cell?
A. This is a cytotoxic T cell that interacts with the helper T cell through an MHC class II molecule.
B. This is a cytotoxic T cell that interacts with the helper T cell through an MHC class I molecule.
C. This is an antigen-presenting cell that interacts with the helper T cell through an MHC class I molecule.
D. This is an antigen-presenting cell that interacts with the helper T cell through an MHC class II molecule.
Answer: D
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A __________ is a fibrous sac filled with synovial fluid found adjacent to a joint cavity.
Fill in the blank(s) with the appropriate word(s).
Answer the following statements true (T) or false (F)
1. Small arteries that arise on the posterior surface of the aorta and supply the spinal cord and the abdominal wall are the lumbar arteries. 2. Long, thin arteries, present only in males, that originate between the superior and inferior mesenteric arteries are the testicular arteries. 3. The liver, stomach, and spleen are supplied by the celiac trunk. 4. Veins that empty into a network of dural sinuses are the superficial cerebral veins.
Chronic renal failure is insidious because up to __________% of the kidney tissue can be destroyed before the loss of kidney function is even noticeable
Fill in the blank(s) with correct word
During which stage of sexual response do sympathetic neurons constrict the arteries bringing blood to the penis?
A. Ejaculation B. Resolution C. Arousal D. Emission