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Iseel Espinoza - Phy
Week 7
| Question | Answer |
|---|---|
| What physiological process occurs in the bone marrow? | Hematopoiesis. The production of blood cells, primarily in red bone marrow. |
| What are two major functions of the integumentary system? | Sensation and temperature regulation. |
| How does the skin regulate body temperature? | Through vasodilation and sweating to release heat, and vasoconstriction to conserve heat. |
| What type of receptors in the skin detect touch, pain, and temperature? | Sensory receptors located in the dermis and epidermis. |
| What happens when the parathyroid gland fails to respond to calcium binding to its receptors? | PTH secretion is disrupted, leading to hypocalcemia, muscle cramps, and potential hyperphosphatemia due to phosphate retention. |
| What is the main hormone secreted by the parathyroid gland and its function? | Parathyroid hormone (PTH), which increases blood calcium levels by stimulating bone resorption, increasing kidney calcium reabsorption, and activating vitamin D. |
| What happens when calcium binds to troponin? | Tropomyosin shifts away from actin binding sites, allowing myosin heads to form cross-bridges and cause contraction. |
| What do ligand-gated ion channels do? | They open or close in response to a chemical messenger (ligand), allowing ions to move across the cell membrane. |
| What ions commonly move through ligand-gated ion channels? | Potassium, sodium, chloride, and calcium. |
| What triggers the release of acetylcholine (ACh) at the neuromuscular junction? | An action potential reaching the motor neuron’s axon terminal. |
Created by:
iseel26