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Gabriela Medina
Human Physiology week 1-6
| Question | Answer |
|---|---|
| What is homeostasis | The body’s ability to maintain a stable internal environment despite external changes. |
| What are the four main types of human tissue? | Epithelial, connective, muscle, and nervous tissue. |
| What is the function of the mitochondria? | It produces ATP, the main energy source for cellular processes. |
| What happens during diffusion? | Molecules move from an area of high concentration to an area of low concentration. |
| What are ligand-gated ion channels responsible for? | Allowing ions to pass through the membrane when a neurotransmitter binds to them. |
| What is the role of calcium in muscle contraction? | Calcium binds to troponin, exposing binding sites on actin so myosin can attach and cause contraction. |
| What is the sliding filament theory? | A model explaining how actin and myosin filaments slide past each other to produce muscle contraction. |
| What is the difference between the central and peripheral nervous systems? | The central nervous system includes the brain and spinal cord; the peripheral includes all other nerves. |
| What is the purpose of the sodium-potassium pump? | To maintain resting membrane potential by moving sodium out of and potassium into the cell. |
| What is a neurotransmitter? | A chemical messenger that transmits signals across the synaptic cleft between neurons. |
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