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Davyd B.

wk 1-7 cards

QuestionAnswer
What is the smallest structural and functional unit of life? The cell
What is homeostasis? The body’s ability to maintain a stable internal environment despite external changes
What organelle is known as the "powerhouse" of the cell? Mitochondria
What type of feedback mechanism maintains most homeostatic processes? Negative feedback
Which tissue type is responsible for movement in the body? Muscle tissue
What part of a neuron receives incoming signals? Dendrites
What is the function of the sarcoplasmic reticulum in muscle cells? To store and release calcium ions (Ca²⁺) for muscle contraction
What molecule provides the immediate source of energy for muscle contraction? ATP (Adenosine Triphosphate)
What is the difference between isotonic and isometric contractions? Isotonic contractions change muscle length; isometric contractions maintain the same length while tension increases
What happens during depolarization of a neuron? Sodium ions (Na⁺) rush into the cell, making the inside more positive
Created by: user-1988187
 

 



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