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Kathryn Thomas
SCI-221-Week 7: Assignment - StudyStack Set 1
| Question | Answer |
|---|---|
| What is homeostasis? | The maintenance of relatively stable internal conditions despite changes in the external environment (Chapter 2). |
| Name the four major categories of biomolecules. | Carbohydrates, lipids, proteins, nucleic acids (Chapter 4). |
| What is osmosis? | The diffusion of water molecules across a semipermeable membrane from lower solute concentration to higher. |
| Fill in the blank: Mitochondria are the “______ of the cell.” | powerhouses |
| What does epithelial tissue cover or line? | Surfaces, cavities, and glands (Chapter 8). |
| Define osteocyte. | A mature bone cell that maintains the bone matrix (Chapter 11). |
| What is the difference between a ligament and a tendon? | Ligaments connect bone to bone; tendons connect muscle to bone (related to chapters 13–14). |
| What is synovial fluid’s function in a joint? | Lubricates, nourishes, and reduces friction in synovial joints (Chapter 14). |
| Describe the sliding filament theory of muscle contraction. | During contraction, actin filaments slide over myosin filaments, shortening the sarcomere (Chapter 17). |
| Term: Action potential | A rapid, transient change in membrane potential that propagates along an axon (related from cellular chapters). |
| What is the resting membrane potential value (approx)? | Around –70 mV (inside vs outside of neuron) |
| Fill in: The sarcoplasmic reticulum stores and releases ____ ions in muscle cells. | calcium |
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Kathrynt7924