smooth muscle. True A contraction in which the muscle does not shorten but its tension increases is called isometric True One of the important functions of skeletal muscle contraction is production of heat. True What is the role of tropomyosin in skeletal muscles? A) Tropomyosin is the name of a contracting unit. B) Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules. C) Tropomyosin serves as a contraction inhibitor by blocking the
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an AP?: no nerve response What is the effect of lidocaine on eliciting an AP?: Blocks sodium ion channels from opening‚ inhibiting AP. What is the equation for Fick’s First Law of Diffusion?: J = -DA△ｃ/△ｘ What is the key variable in an isometric contraction?: muscle length What is the relationship b/w size of a nerve and conduction velocity?: The larger the nerve‚ the faster the conduction velocity. What is the role of hypothalamus in the production of thyroxine & TSH?: It is a primary endocrine
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Found only in the heart‚ cardiac muscle is responsible for pumping blood throughout the body. Cardiac muscle tissue cannot be controlled consciously‚ so it is an involuntary muscle. While hormones and signals from the brain adjust the rate of contraction‚ cardiac muscle stimulates itself to contract. The natural pacemaker of the heart is made of cardiac muscle tissue that stimulates other cardiac muscle cells to contract. Because of its self-stimulation‚ cardiac muscle is considered to be autorhythmic
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high blood pressure 35. hypertrophy increase in size of muscle from training hypokinetic disease from too little exercise 37. increase hdl decrease chance of heart attack 38. isometric muscle contraction when the muscle upholds its shape 39. isotonic muscle changing length when used 40. lb of body fat 3‚500 calories 41. LDL cholesterol surrounded by protein‚ "bad cholesterol" leading medical complaint headache lumbar lordosis
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CHAPTER 3: THE MUSCULAR SYSTEM Three Types of Muscle * Muscle tissue is a collection of cells that shorten during contraction which create tension that results in movement * Tendons are touch bands of connective tissue that join muscle with bones Skeletal muscles * Muscles that are attached to bone (by tendons and other tissue) * Comprise 30 to 40% of human body weight * Humans have conscious control (conscious muscle) over these muscles (the brain can tell them what to do)
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through the urinary tract. C) Its function is largely under involuntary control. D) It is a kind of connective tissue. E) It is responsible for locomotion. Answer: e Level: 1 5. Which of the following actions is caused by contraction of skeletal muscle? A) contraction of the heart B) moving your feet in walking C) movement of food through the G.I. tract D) emptying of the urinary bladder E) vasoconstriction Answer: b Level: 2 6. Smooth muscle and cardiac muscle are similar in that they
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time of stimulation and the beginning of contraction b). Contraction – at this stage the muscle reaches its peak in contraction. Relaxation -Muscle is shortened‚ returns to zero and back initial length. In activity 2 how long was the latent period? It was 2.2 msec. Describe the chemical changes that are occurring during this period. Calcium levels are low since muscle contraction is not at its peak. Preparing on the contraction Ca begin the process of sending
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potential in skeletal muscle travels through the muscle via T-tubules true 15. Ca2+ is essential for normal contraction of skeletal muscle. true 16. A twitch of one skeletal muscle fibre is an example of a graded response. TRUE 17. A motor unit is a single motor neurone and the muscle fibres that it innervates. true 18. The three phases of a muscle twitch are described as latent‚ contraction and relaxation. true 19. The force exerted on an object by
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exposure to an infection and subsequent illness‚ or that between the instant of stimulation and the beginning of response. 2. What is the role of acetylcholine in a skeletal muscle contraction? Acetylcholine is the chemical signal the nerve sends to the muscle to cause contraction 3. Describe the process of excitation-contraction coupling in skeletal muscle fibers. ACH is released at the end-plate potential. ACH diffuses into the sarcolemma‚ attaches to the receptors in the motor end plate and causes
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Active Contraction Type Joint Action Tendencies of Outside Forces Undesired Action(s) of Recruited Muscles Explanation for Absence of Undesired Action(s) Wrist (Radiocarpal Joint) None (Used as stabilizers throughout exercise) Extensor Carpi Radialis Brevis (ECRB) Isometric Gravity is a motive force to extend the wrist Momentum is a motive force to extend the wrist None Extensor Carpi Radialis Longus (ECRL) Isometric None Extensor Carpi Ulnaris (ECU) Isometric Adducts
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