25a A&P: Muscular System -! Mechanism of Contraction
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1 25a A&P: Muscular System -! Mechanism of Contraction
2 25a A&P: Muscular System -! Mechanism of Contraction! Class Outline" 5 minutes" "Attendance, Breath of Arrival, and Reminders " 10 minutes "Lecture:" 25 minutes "Lecture:" 15 minutes "Active study skills:" 60 minutes "Total"
3 Quizzes:! 25a A&P: Muscular System -! Mechanism of Contraction! Class Reminders"! 29b Kinesiology Quiz" Supraspinatus, infraspinatus, teres major, subscapularis, pec minor, & serratus anterior"! 31a Written Exam Prep Quiz (20a, 20b, 21b, 22a, 23a, 24b, 29b, and 30a)"! 32a Written Exam Prep Quiz (24a, 25a, 26a, 27a, 28a, 29a, 30b, and 31b)" Assignments:!! 30a Review Questions" Packet A: " Preparation for upcoming classes: "! 26a A&P: Muscular System - Fiber Types, Actions, and Contractions" Trail Guide: pectoralis minor" Salvo: Pages " Packet E: 43-46" Packet A-132"! 26b Hydrotherapy: Cold Water Treading, Facial, and Herbal Wrap" Packet G: 21-24"
4 Classroom Rules" Punctuality - everybody s time is precious"! Be ready to learn at the start of class; we ll have you out of here on time"! Tardiness: arriving late, returning late after breaks, leaving during class, leaving early" The following are not allowed:!! Bare feet"! Side talking"! Lying down"! Inappropriate clothing"! Food or drink except water"! Phones that are visible in the classroom, bathrooms, or internship" You will receive one verbal warning, then you ll have to leave the room.!
5 Rotator Cuff! Trail Guide, page 74" Supraspinatus Infraspinatus Teres Minor Subscapularis "S" "I" "T" "S" Posterior View" Anterolateral View"
6 Rotator Cuff! Trail Guide, Page 74" Supraspinatus" Posterior View" Infraspinatus" Posterior View" Teres Minor" Posterior View" Subscapularis" Anterior View"
7 Subscapularis! Trail Guide, Page 74" Subscapularis is located on the scapula s anterior surface." Only a small portion of its muscle belly is accessible. " Subscapularis is the only rotator cuff muscle that attaches to the lesser tubercle of the humerus." What do you use subscapularis for?" Anterolateral View"
8 A" O" I" Anterior View"
9 A" O" I" Anterior View"
10 A" O" I" Anterior View"
11 A" O" I" Anterior View"
12 Rotator Cuff! Trail Guide, Page 74" Supraspinatus" Posterior View" Infraspinatus" Posterior View" Teres Minor" Posterior View" Subscapularis" Anterior View"
13 25a A&P: Muscular System - " Mechanism of Contraction" E-39"
14 Mechanism of Contraction" Mechanism of Contraction!
15 Nerve impulse Electrical signal that conveys information along a neuron."
16 Motor neuron Neuron that sends a nerve impulse to a muscle cell."
17 Motor unit Single motor neuron plus all the muscle fibers it innervates." Note: one motor neuron can innervate 2 to 2000 muscle fibers."
18 Neuromuscular junction Junction between a motor neuron and the sarcolemma."
19 Synaptic cleft (AKA: synaptic gap) Space between the end of a motor neuron and another neuron, a muscle cell, or gland."
20 Acetylcholine Neurotransmitter that crosses the synaptic cleft."
21
22 Non-Contracting State: Two protein molecules, troponin and tropomyosin, are positioned on thin myofilaments to block myosin binding sites. Without these regulatory proteins, muscles would be in a constant state of contraction. "
23 Excitation of the Sarcolemma: The contraction of a skeletal muscle begins with " a nerve impulse sent from the central nervous system. When the nerve impulse reaches the neuromuscular junction, calcium ions are released from the sarcoplasmic reticulum. "
24 Excitation of the Sarcolemma"
25 Cross-Bridging: Now that calcium is present in the sarcomere, it binds to " troponin causing tropomyosin to slide off and expose the site allowing myosin heads to bind to thin myofilaments. "
26 Power Stroke: Myosin heads, which are hinged at their base, then toggle in a " mechanism similar to a light switch. This action causes thin myofilaments to slide " toward the center of the sarcomere which shortens the overall length of the muscle fiber. Yeah! We have contraction! "
27 Detachment: If ATP (adenosine triphosphate) is present, myosin head the detach themselves, bind to the next exposed site, and pull again! "
28 All or None Response: When a motor neuron delivers a stimulus of " contraction, all the muscle fibers of the motor unit receive the same signal at the same time and contract to their fullest extent. There is no partial contraction. "
29 Recruitment: Numerous motor units are linked to a single skeletal muscle. The " nervous system regulates the amount of muscular contraction by activating only the motor units needed to perform a given action. If more strength is required, then additional motor units are recruited resulting in a stronger muscle contraction. "
30 Relaxation: Almost immediately after the sarcoplasmic reticulum releases " calcium ions into the sarcomeres, it begins to actively pump them back into its sacs. Freed from its chemical bond with the calcium ions, the tropomyosin slides back to cover the myosin binding sites on thin myofilaments. This action releases the myosin heads and returns them to their pre-contraction resting state. The muscle is now at rest. "
31 25a A&P: Muscular System -! Mechanism of Contraction"
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26a A&P: Muscular System -! Fiber Types, Actions, and Contractions
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