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Module 3 homework Which of these characteristics applies only to cardiac muscle tissue? stimulated by hormones involuntary striations intercalated discs What type of muscle tissue is both striated and involuntary? skeletal muscle cardiac muscle visceral muscle smooth muscle Which of the following is NOT a function of the muscular system? generation of heat stabilization of joints hematopoiesis production of movement maintenance of posture
|Reset smooth muscle tissue 1. | Skeletal muscle tissue | Muscle tissue that maintains posture, body position, and stabilizes joints. skeletal muscle tissue 2. | Cardiac muscle tissue | Muscle tissue found only in the heart. | 3. | Skeletal muscle tissue | Muscle tissue that is multinucleate. 4. | Smooth muscle tissue | Performs very slow, sometimes rhythmic, contractions. 5. | Skeletal muscle tissue | Voluntary muscle tissue. 6. | Smooth muscle tissue | Muscle tissue that forms valves to regulate the passage of substances through internal body openings. 7.| Smooth muscle tissue | Muscle tissue that activates arrector pili muscles to stand hairs on end. 8. | Cardiac muscle tissue | Muscle tissue composed of branching cells and intercalated discs. Smooth muscle cells are branched multinucleate cylindrical involuntary striated A motor neuron and all of the skeletal muscle fibers it stimulates are termed a neuromuscular junction neurotransmitter synaptic cleft myofilament motor unit
v PartA The cross bridge cycle is a series of molecular events that occur after excitation of the sarcolemma. What is a cross bridge? » View Available Hint(s) A myosin head bound to actin Calcium bound to troponin ATP bound to a myosin head Troponin bound to tropomyosin Previous Answers « Correct Yes! As soon as the activated myosin head forms a cross bridge with actin, the power stroke begins. v PartB What structure is the functional unit of contraction in a skeletal muscle fiber? » View Available Hint(s) The cross bridge The triad The sarcomere The junctional folds of the sarcolemma Calcium ions couple excitation of a skeletal muscle fiber to contraction of the fiber. Where are calcium ions stored within the fiber? » View Available Hint(s) Calcium ions are stored in the mitochondria. Calcium ions are stored in the nuclei. Calcium ions are stored in the transverse tubules. Calcium ions are stored in the sarcoplasmic reticulum. Previous Answers v Correct Yes! Sarcoplasmic reticulum is the specific name given to the smooth endoplasmic reticulum in muscle fibers. The sarcoplasmic reticulum is very elaborate in skeletal muscle fibers, allowing for significant storage of calcium ions. r PartD After a power stroke, the myosin head must detach from actin before another power stroke can occur. What causes cross bridge detachment? » View Available Hint(s) ADP and inorganic phosphate are bound to the myosin head. Acetylcholine binds to receptors in the junctional folds of the sarcolemma. Calcium ions bind to troponin. ATP binds to the myosin head.
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Which neurotransmitter is released by motor neurons at the neuromuscular junction? acetylcholinesterase sodium potassium ‘ acetylcholine ‘ What initiates an action potential on a muscle cell? myosin cross bridges binding to actin acetylcholine binding to receptors on the sarcolemma within the neuromuscular junction acetylcholinesterase ATP During skeletal muscle contraction, myosin heads attach to binding sites associated with myosin filaments Z discs thick filaments the H zone actin filaments What mineral is released within muscle cells to trigger contraction? potassium sodium ATP ‘ calcium ‘
[ 3 1. | Calcium ions | The sarcoplasmic reticulum stores this chemical pecific neurotransmitter that stimulates skeletal muscle cells Chemical that enters a muscle cell upon excitation t J 4. [ Synaptic cleftl Gap between the axon terminals and the plasma membrane of a neighboring 5. | Action potential | Electrical current that travels the length of the muscle 6. | Acetylcholinesterase | Enzyme that breaks down acetylcholine (ACh) | Reset| | Help Py N - d - Gluteus medius Gluteus maximus Adductor magnus ( > , , Semimembranosus
Vastus lateralis Calcaneal tendon | Reset| | Help
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