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Anat./Phys.
Unit 6 Muscle Quiz 12/01/23
| Question | Answer |
|---|---|
| 3 Types of Human Muscles | 1) Skeletal Muscles 2) Cardiac Muscles 3) Smooth Muscles |
| Characteristics of Skeletal Muscles | - multinuclei - voluntary -striated |
| Characteristics of Cardiac Muscles | - involuntary - striated - 1 nuclei |
| Characteristics of Smooth Muscles | - smmoth involuntary - 1 nuclei |
| Location of Skeletal Muscles | skeleton |
| Location of Cardiac Muscles | heart |
| Location of Smooth Muscles | digestive system |
| Function of Skeletal Muscles | movement of bones |
| Function of Cardiac Muscles | movement of blood |
| Function of Smooth Muscles | movement of nutrients |
| Nuclei Presence Significance | multi nuclei vs. 1 nuclei - multinuclei = multiple nuclei ,no mitosis - 1 nuclei = only one nuclei, mitosis |
| Voluntary vs. Involuntary Explanation | voluntary= requires conscious thought and action to complete involuntary = requires no thought or action to complete, happens on its own |
| Striated vs. Smooth Explanation | striated= muscles with striped appearance (have dark bands) smooth = muscles with smooth appearance (no dark bands) |
| What is a Muscle Fiber? | an elongated contractile cell that forms the muscles of the body |
| Functions of Muscles | - excitability - condiuctivity - contractability - etensobility - elasticity |
| Excitability | responsiveness to chemical signals, stretch, and electrical changes across the plasma membrane |
| Conductivity | local electrical excitation sets off a wave of excitation that travels along the muscle fiber |
| Contractability | shortens when stimulated |
| Extensibility | capable of being stretched between contractions |
| Elasticity | returns to its original rest length after being stretched |
| Endomysium | :connective tissue around muscle cell |
| Myofibril | long protein cords occupying most of sarcoplasm |
| Sarcoplasmic reticulum (SR) | smooth ER that forms a network around each myofibril |
| T Tubules | tubular infoldings of the sarcolemma which penetrate through the cell and emerge on the other side |
| Terminal cisterns | dilated end-sacs of SR which cross the muscle fiber from one side to the other |
| Fascicle | A bundle of muscle fibers within a muscle. Supplied by nerves and blood vessels and enclosed in a fibrous perimysium that separates it from neighboring fascicles. |
| Muscle Fiber | A single muscle cell. Slender, elongated, threadlike, enclosed in a specialized plasma membrane (sarcolemma) |
| Slow Twitch vs. Fast Twitch | slow twitch muscles are more for endurance while fast twitch muscles are for speed |
| Fatigue Resistance in Slow Twitch Muscles | Good (do not tire easily) |
| Fatigue Resistance in Fast Twitch Muscles | Bad (tire easily) |
| What us Myoglobin? | a protein found in the muscle cells of animals (stores oxygen) |
| Myoglobin Content of Slow Twitch Muscles | High |
| Myoglobin Content of Fast Twitch Muscles | Low |
| Glycogen Content of Slow Twitch Muscles | Low |
| Glycogen Content of Fast Twitch Muscles | High |
| Mitochondria Levels of Slow Twitch Muscles | High |
| Mitochondria Levels of Fast Twitch Muscles | Low |
| Capillary Levels of Slow Twitch Muscles | High |
| Capillary Levels of Fast Twitch Muscles | Low |
| Color of Slow Twitch Muscles | Red |
| Color of Fast Twitch Muscles | White |
| Examples of Slow Twitch Muscles | - lower leg muscles - back muscles - calfs - neck |
| Examples of Fast Twitch Muscles | - hamstring - eyelids - biceps |
Created by:
emmaleighow
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