Presentation on theme: "The Muscular System 5 Lesson 5.1: Muscle Tissue Categories and Functions Lesson 5.2: Skeletal Muscle Actions Lesson 5.3: The Major Skeletal Muscles Lesson."— Presentation transcript:
7Skeletal Muscle Organization sarcolemma and endomysium surrounds the muscle fiberperimysium bundles groups of muscle fibers to make up a fascicleepimysium encloses several fascicles to make up a muscleaponeurosis connects muscle to other tissues
9Review and AssessmentTrue or False? 1. Smooth muscle is voluntary. 2. Cardiac muscle has branching fibers. 3. Smooth muscle is multinucleate. 4. Perimysium wraps fascicles to make a muscle. 5. Endomysium surrounds the muscle fibers.
10Behavioral Properties of Muscle extensibility–stretchelasticity–snap backirritability–respondcontractility–shorten
11Muscle Tissue Functions tension and types of skeletal muscle contractionagonist–moves boneantagonist–opposes the movement of the agonist
13Eccentric Contraction agonist contracts while lengthening, antagonist relaxes
14Isometric Contraction both agonist and antagonist contract
15Review and AssessmentMatch these words with 1–5 below: extensibility, elasticity, irritability, contractility, agonist, antagonist. 1. respond 2. opposes movement 3. stretch 4. shorten 5. causes movement
17Skeletal Muscle the motor unit skeletal fiber types muscular strength, power, and endurance
18The Motor Unitgroup of muscle fibers under the control of one motor neuron
19Generating Action Potentials acetylcholine crosses the synaptic cleft at the neuromuscular junctiondepolarization takes place on muscle fiberaction potential begins
20Contraction of the Sarcomeres sarcomeres shorten by actin filaments sliding along myosin filaments
21Maximum Tension and Return to Relaxation action potential always causes entire motor unit muscle fibers to contractall-or-none law
22Review and Assessment True or False? 1. An action potential causes one half of the fibers in the motor unit to contract.2. Acetylcholine crosses the synaptic cleft at the neuromuscular junction.3. The sarcomeres lengthen by myosin filaments sliding over actin filaments.
25Muscular Strength rotary force that muscles can produce at a joint the maximum weight you can lift is a measurement of muscular strength
26Muscle Power force x velocity how fast you can sprint is a measurement of muscle power
27Muscle Endurance muscle tension/time how far you can run is a measurement of muscle endurance
28Review and AssessmentMatch these words with 1–5 below: muscle endurance, muscular strength, muscle power, Type I, Type IIb. 1. force x velocity 2. muscle tension/time 3. rotary force that muscles can produce at a joint 4. slow twitch, slow fatigue 5. fast twitch, fast fatigue
29The Major Skeletal Muscles Chapter 5: The Muscular SystemLesson 5.3The Major Skeletal Muscles
30The Major Skeletal Muscles directional motionshead and neck musclestrunk musclesupper limb muscleslower limb muscles
31Skeletal Muscle Attachments originfixed end of a muscleinsertionmovable end of a muscle
36Review and AssessmentTrue or False? 1. Circumduction is a multiple plane movement. 2. Supination is a multiple plane movement. 3. The insertion is the fixed end of a muscle. 4. Extension is a sagittal plane movement. 5. Adduction is a frontal plane movement.
47Review and AssessmentTrue or False? 1. Tendinitis is muscle strain. 2. A contusion is a bruise. 3. Whiplash is a joint injury. 4. A hernia is a tendon injury. 5. A strain is an over stretch of a tendon.