Cardiovascular — Flashcards

Flashcard 651: What visual deficit results from lesion of the macula?_____

Answer: Central scotoma

Flashcard 652: Which epithelial cell junction permits electrical/chemical communication between cells? _____

Answer: Gap junctions

Flashcard 653: Which primary lymphoid organ is the site for immune cell production? (Bonus: What is the survival signal?)

Answer: Bone marrow Bonus: IL-7

Extra: Primary lymphoid organs (bone marrow and thymus) are the sites where lymphocytes are produced and undergo maturation. 1. **Bone marrow**: The site of hematopoiesis (production of all immune cells) and the site of B-cell maturation. 2. **Thymus**: The site of T-cell maturation (T-cells are produced in the bone marrow but migrate to the thymus). 3. **IL-7**: A critical cytokine produced by stromal cells in the primary lymphoid organs that acts as a survival and proliferation signal for lymphoid progenitors.

Flashcard 654: Which region of the lymph node enlarges during an extreme cellular immune response (e.g., viral infection)?

Answer: Paracortex

Flashcard 655: Hyperthyroidism _____ number and sensitivity of B-adrenergic receptors

Answer: increases

Flashcard 656: Toxic megacolon describes the cessation of colonic contractions by way of transmural inflammation that results in significantly increased _____ release

Answer: nitric oxide

Flashcard 657: Why are left-sided valvular lesions not seen in a patient with carcinoid heart disease?_____

Answer: blood passes through the lung, which contains MAO, thus converting 5-HT to 5-HIAA before reaching the left heart

Flashcard 658: Scurvy (vitamin C deficiency) is associated with poor _____ healing

Answer: wound

Flashcard 659: The luminal (epithelial) cell layer of breast tissue is responsible for _____ in the lobules

Answer: milk production

Flashcard 660: In the circulation, most of the T3 and T4 is bound to _____

Answer: thyroxine-binding globulin (TBG)