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Chapter 6 The Muscular System Answer Key — Semi Trucks For Sale Craigslist

The muscle spindle signals muscle length and velocity to the CNS through two types of specialized sensory fibers that innervate the intrafusal fibers. Chapter 6 the muscular system answer key. Compensation for the physical characteristics of the body and muscles. 6 Disorders of the Muscular System: Review Questions and Answers. There are two principles that govern the relationship between motor neuron activity and muscle force: the rate code and the size principle.

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The motor system must adapt to changing circumstances. Please read our Terms of Use and Privacy Notice before you. Muscular system worksheet answer key. Although intrafusal fibers do not contribute significantly to muscle contraction, they do have contractile elements at their ends that are innervated by motor neurons. Muscle fibres are the cells that make up skeletal muscle tissue. The motor system is divided into a number of different areas that control different aspects of movement (a "divide and conquer" strategy). Outline the cause and progression of myasthenia gravis. When you move you can feel how your bones support you, facilitate your movement, and protect the soft organs of your body.

The arm would straighten out. Describe the relationship between muscles, muscle fibres, and fascicles. C. Rate code This answer is CORRECT! Chapter 6 the muscular system answer key.com. Its cells contains a great many mitochondria to produce ATP for energy and help the heart resist fatigue. The unique connective tissue that fills the interior of most bones is referred to as bone marrow. Instead, they are controlled by the autonomic nervous system, hormones, and other substances.

Chapter 6 The Muscular System Answer Key

It occurs when a tendon is over-extended or worked too hard without rest. What is a skeletal muscle contraction? Padding of a strained muscle protects it from further impact. This concept is illustrated in Figure 1. During the stretch, the two types differ in their responses. Explore our Web site. C. - D. - E. Types of fibers contained within muscle spindles include... A. People with more slow-twitch fibres may be able to develop greater endurance from aerobic exercise, whereas people with more fast-twitch fibres may be able to develop greater muscle size and strength from anaerobic exercise. Benefits of flexibility exercise include improving range of motion and reducing risk of injury. Like the nuclear chain fiber, these fibers signal information about the static length of a muscle. Alpha motor neurons innervate extrafusal fibers, the highly contracting fibers that supply the muscle with its power. As the amount of current increases, the membrane potential of the larger motor neuron also increases, until it also reaches firing threshold. Extrafusal fibers are outside the muscle spindle.

All of the motor neurons in a motor neuron pool innervate a single muscle (Figure 1. Through vision, audition, somatosensation, and the other senses, we perceive the world and our relationship to it. Physical exercise is defined as any bodily activity that enhances or maintains physical fitness and overall health even if it is not done for its health benefits. Genetic differences in proportions of slow-twitch and fast-twitch skeletal muscle fibres may influence how people respond to physical exercise. With stronger inputs, more motor neurons will be recruited, resulting in more force applied to the muscle (Play 2 and Play 3). Contractions of cardiac muscle are involuntary like those of smooth muscle. Raising one's hand from a resting position on a desk, compared to a resting position on top of the head, results in the same final position of the arm, but these two movements require different patterns of muscle activation. Hard, dense connective tissue that forms the structural elements of the skeleton. 5 Physical Exercise: Review Questions and Answers. They are attached to actin filaments. Why is the heart the muscle that performs the greatest amount of physical work in the course of a lifetime? The motor system has a set of sensory inputs (called proprioceptors) that inform it of the length of muscles and the forces being applied to them; it uses this information to calculate joint position and other variables necessary to make the appropriate movement.

Muscular System Worksheet Answer Key

9 shows the responses of each type of afferent to a linear stretch of the muscle. The Golgi tendon organ is a specialized receptor that is located between the muscle and the tendon (Figure 1. The filaments are arranged in repeating units called sarcomeres, which are the basic functional units of skeletal muscles. Unconscious processing. Skeletal muscles also have connective tissue supporting and protecting the muscle tissue. Cat Muscles Lab Guide - checklist of the muscles you need to identify on the cat. What are musculoskeletal disorders? Many people who overwork their muscles develop delayed onset muscle soreness (DOMS), which may be caused by tiny tears in muscle fibres. Fast-twitch, fatigue-resistant fibers are recruited when the input onto motor neurons is large enough to recruit intermediate-sized motor neurons.

Give three reasons that muscle atrophy may occur. Carpal tunnel syndrome may be treated by wearing a wrist splint, receiving corticosteroid injections, or undergoing surgery to cut the carpal ligament and reduce pressure on the median nerve. What may explain the positive benefits of physical exercise on cognition? Other organ systems rely on this calcium for action (specifically, muscle contraction and neural signaling). Additional Practice and Other Resources. Sample answer: If the acetylcholine receptors were blocked, muscle contraction would be prevented or at least inhibited. The heart is the muscle that performs the greatest amount of physical work in the course of a lifetime because it beats continuously throughout life without rest.

Chapter 6 The Muscular System Answer Key.Com

On Earth, muscle cells are continually challenged by gravity, and moving and lifting objects against gravity is a form of physical activity that helps maintain the size of muscle fibres. Therefore, an increase in muscle size generally causes an increase in strength, and a decrease in muscle size generally causes a decrease in strength. Some orthopedists sub-specialize in sports medicine, which addresses both simple injuries, such as a sprained ankle, and complex injuries, such as a torn rotator cuff in the shoulder. Be prepared to spend a fair amount of time on this unit. Two terms are used to describe the anatomical relationship between motor neurons and muscles: the motor neuron pool and the motor unit. Muscle fibres are bundled together in fascicles. There are two types of bone marrow: yellow bone marrow and red bone marrow.

In the areas of the skeleton where whole bones move against each other (for example, joints like the shoulder or between the bones of the spine), cartilages, a semi-rigid form of connective tissue, provide flexibility and smooth surfaces for movement. Its symptoms include progressive skeletal muscle weakness due to the death of muscle cells and tissues. They are themselves components of complex circuits that perform sophisticated information processing. Z discs are structures that mark the end of a sarcomere in a muscle fibre. Skeletal muscle is attached to bones, cardiac muscle makes up the walls of the heart, and smooth muscle is found in the walls of internal organs and other internal structures. Motor neurons use a rate code to signal the amount of force to be exerted by a muscle. 2 Some Necessary Components of Proper Motor Control. For example, your ribs protect your lungs and heart, the bones of your vertebral column (spine) protect your spinal cord, and the bones of your cranium (skull) protect your brain (see Figure 6. Because a heavy load is now placed on the biceps, the Ib afferents fire vigorously. They do not have to program the exact force and velocity of individual muscles, or coordinate movements with changes in posture; these low-level tasks are performed by the lower levels of the hierarchy. Why is skeletal muscle tissue striated? The motor system requires sensory input in order to function properly. These minerals, incorporated into bone tissue, can be released back into the bloodstream to maintain levels needed to support physiological processes.

The function of intrafusal fiber contraction is not to provide force to the muscle; rather, gamma activation of the intrafusal fiber is necessary to keep the muscle spindle taut, and therefore sensitive to stretch, over a wide range of muscle lengths. Explain sliding filament theory and describe crossbridge cycling. The famous physiologist Sir Charles Sherrington referred to these motor neurons as the "final common pathway" in motor processing. This chapter is divided into three main sections: muscle basics and cellular components, naming of the muscles, and cat muscles with dissection. Sample answer: Smooth muscles in the blood vessels can contract to cause vasoconstriction, or relax to cause vasodilation. A muscle strain occurs when muscle fibres tear as a result of overstretching. The organ is innervated by primary afferents called Group Ib fibers, which have specialized endings that weave in between the collagen fibers.

How does physical exercise compare with antidepressant drugs in the treatment of depression?

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