Cardiovascular — Flashcards

Flashcard 651: Which androgen is responsible for differentiation of the external male genitalia (penis and scrotum)? _____

Answer: Dihydrotestosterone (DHT)

Flashcard 652: Hypoxia may be caused by a _____ cardiac output

Answer: decreased

Flashcard 653: Mechanisms for dissipating heat are coordinated in the _____ hypothalamus

Answer: anterior

Flashcard 654: 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 655: What non-nucleated cell expresses MHC class I? _____

Answer: Platelets

Flashcard 656: The luminal (epithelial) cell layer of breast tissue is responsible for _____ in the lobules

Answer: milk production

Flashcard 657: What type of calcium channels (2) exist in the SA node?_____

Answer: L-type (primary) and T-type

Flashcard 658: Which epithelial cell junction permits electrical/chemical communication between cells? _____

Answer: Gap junctions

Flashcard 659: Hyperthyroidism _____ number and sensitivity of B-adrenergic receptors

Answer: increases

Flashcard 660: Toxic megacolon describes the cessation of colonic contractions by way of transmural inflammation that results in significantly increased _____ release

Answer: nitric oxide