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muscle,bone, skin-8
chapter 8
| Question | Answer |
|---|---|
| muscle responsible for movement - contracts | agonist |
| muscle that stretches | antagonist |
| upper arm | antagonist |
| biceps | antagonist |
| triceps | antagonist |
| assist the agonist muscle by stabilizing the origin bone | synergistic |
| which bands get smaller in a sarcomere | H and I |
| which band does not change size in a sarcomere | A |
| skeletal muscle is made up of | sarcomere |
| thick filament | myosin |
| thin filaments | actin |
| what 2 proteins are attached to actin | tropomysosin & troponin |
| muslce fiber--> myofilaments ---> myofibril --> sarcomere | |
| Each myofibril is made of specialized ER cells called | sarcoplasmic reticulum |
| skeletal muscles= | mutinucleated |
| uniform contraction of muscles are acheived by | T Tubules |
| acetylcholine releases ion channels into the | sarcollemma (membrane wrapping several myofibrils together) |
| muscle cells DO not undergo | mitosis |
| oxygen is stored in muscle cells by | myoglobin |
| type 1 muscle fibers=slow | contain alot of mitochondira and myoglobin |
| Tybe 2 muscle fibers= fast | less resistant to fatigue, no myoglobin, lots of glucose (white under microscope) |
| loss of ATP= | prevent myosin from releasing from actin |
| permanent sequestring of Ca2+ in the SR, would | prevent myosin from binding to actin |
| Cardiac muscle= | striated/ has sarcomeres/ uninucleated |
| skeletal muscle and cardiac muscle grow by | hypertrophy |
| smooth muscle/ cardiac is innervated by | ANS (involuntary) |
| skeletal muscle is innervated by | Somatic (voluntary0 |
| Smooth muscle | Dont have sarcomeres, but have thin and thick filaments; has only one nucleus and is NOT striated |
| Smooth muscles are made up of | multi units, single units |
| multi unit | connect directly to neuron |
| single unit | connects to gap junction |
| can contract independantly of other muscles | multi unit |
| intermediate filaments + dense bodies= | smooth muscle |
| osteoclast develop from | monocyte |
| osteoblast from into | osteocyte |
| osteocyte= | exchange waste materials and nutrients within the blood |
| secrete collagen | ostoblast |
| osteoblast,clast,cyte can NOT do? | mitosis |
| spongy bone has | red bone marrow |
| compact is surrounded by MEDULLARY CAVITY IN LONG BONES which contains | yellow bone marrow |
| haversian cannals are made from | osteoclast |
| ca2+ is stored in bone as | hydroxyapetite |
| osteocytes exchange nutrients in lamellae via | cannaculi |
| haversian cannels have | blood, lymph, volkmann's canal |
| lamella+ haversian canal= | Haversian system (osteon) |
| Bone stores | Ca2+ & HPO4 2- |
Created by:
zrsoori
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