Chapter 6 The Muscular System Answer Key - Which Statement Best Summarizes The Central Idea Of This Excerpt? - Brainly.In
It also increases quality of life and longevity. The different areas of the motor system are organized in a hierarchical fashion. The biceps and triceps muscles are shown above. Muscle cells (or fibres) are long, thin cells that are specialized for the function of contracting. The brain has evolved exceedingly complex and sophisticated mechanisms to perform these tasks, and researchers have only scratched the surface in understanding the principles that underlie the brain's control of movement. B. Muscular system worksheet answer key. Intrafusal fibers This answer is INCORRECT. This entire process falls under the subject of motor control. Like the nuclear chain fiber, these fibers signal information about the static length of a muscle. Alpha motor neurons (also called lower motor neurons) innervate skeletal muscle and cause the muscle contractions that generate movement. Name two systems in the body that work together with the muscular system to carry out movements. The system must adapt over time to change its output to accomplish the same goals. Part 2: Naming of the Muscles. Answer the following questions about these arm muscles.
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Chapter 6 Muscular System Answer Key
If the motor neuron fires after the muscle has returned to baseline, then the magnitude of the next muscle twitch will be the same as the first twitch. If a muscle is required only for coarse movements (e. Chapter 6 the muscular system answer key figures. g., a thigh muscle), its motor units will tend to have a high innervation ratio (i. e., each motor neuron innervating 1000 or more muscle fibers), as there is no necessity for individual muscle fibers to undergo highly coordinated, differential contractions to produce a fine movement. Without calcium storage, blood calcium levels change dramatically and affect muscle contraction and neural signaling. Chapter 8: Muscular System. The calcium in osseous tissue is also an important storage site, that can release calcium when needed.
In addition to sensory information about the external environment, the motor system also requires sensory information about the current state of the muscles and limbs themselves. Mineral and Fat Storage, Blood Cell Formation. Sample answer: Tendons and nervous system tissue. Although many of the details are not understood, two broad principles appear to be key concepts toward understanding motor control: - Functional Segregation. Some orthopedic problems can be treated with medications, exercises, braces, and other devices, but others may be best treated with surgery (Figure 6. The unique connective tissue that fills the interior of most bones is referred to as bone marrow. To exert a defined force on an object, it is not sufficient to know only the characteristics of the object (e. g., its mass, size, etc. Chapter 6 muscular system answer key. Describe the structure of a skeletal muscle. Explore our Web site. Is the situation described in part (a) more likely to be an isometric or isotonic contraction? Imagine if walking across the room required thinking about planting the foot at each step, paying attention to the movement of each muscle in the leg and making sure that the appropriate forces and contraction speeds are taking place. Sliding filament theory describes how actin and myosin filaments slide past each other during muscle contraction.
Muscular System Worksheet Answer Key
The function of mitochondria in muscle cells is to provide energy for the muscles in the form of ATP, through aerobic respiration. As we shall see throughout this material on the motor system, our abilities to make movements that are accurate, properly timed, and with proper force depend critically on the sensory input that is ubiquitous at all levels of the motor system hierarchy. Because of their patterns of innervation onto the three types of intrafusal fibers, Group Ia and Group II afferents respond differently to different types of muscle movements. Red blood cells transport oxygen to tissues, and remove carbon dioxide. This elaborate processing would be of limited value, however, unless we had a way to act upon the environment that we are sensing, whether that action consist of running away from a predator; seeking shelter against the rain; searching for food when one is hungry; moving one's lips and vocal cords in order to communicate with others; or performing the countless other varieties of actions that make up our daily lives. The ease with which we make most of our movements belies the enormous sophistication and complexity of the motor system. 10 Sensory Innervation of Muscle Spindles. Neuromuscular disorders are systemic disorders that occur because of problems with the nervous control of muscle contractions or with the muscle cells themselves. D. Golgi tendon organs This answer is INCORRECT. Without this calcium, the bones are not rigid and cannot be supportive.
Myasthenia gravis is a genetic neuromuscular disorder most often caused by immune system antibodies blocking acetylcholine receptors on muscle cells and the actual loss of acetylcholine receptors. The spinal cord is the first level of the motor hierarchy. They are themselves components of complex circuits that perform sophisticated information processing. Tendinitis is inflammation of a tendon. Benefits of flexibility exercise include improving range of motion and reducing risk of injury.
Chapter 6 The Muscular System Answer Key Figures
Small motor neurons innervate slow-twitch fibers; intermediate-sized motor neurons innervate fast-twitch, fatigue-resistant fibers; and large motor neurons innervate fast-twitch, fatigable muscle fibers. Because they do not innervate the dynamic nuclear bag fibers, Group II afferents signal information about muscle length only. Tendons are bundles of collagen fibres that attach skeletal muscles to bone. Explain your answer. 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. The motor system hierarchy consists of 4 levels (Figure 1. Magic School Bus Works Out - Season 3/ Episode 9 (See Netflix). 2 Some Necessary Components of Proper Motor Control. Physical exercise can also increase factors associated with good cardiovascular health, such as "good" cholesterol level and the mechanical efficiency of the heart. Few movements are restricted to the activation of a single muscle. A Golgi tendon organ is made up of a capsule containing numerous collagen fibers (Figure 1. Golgi tendon organs signal information about muscle force, but do not control that force directly.
Some functions of the skeletal system are more readily observable than others. Bone (osseous) tissue. Explain sliding filament theory and describe crossbridge cycling. Alpha-gamma coactivation ensures that muscle spindles maintain sensitivity to stretch over a wide range of muscle lengths. The red bone marrow is responsible for forming red and white blood cells as well as platelets. If this does not occur, the myosin head cannot attach to the actin filament and the "power stroke" cannot occur. Genetic differences in proportions of slow-twitch and fast-twitch skeletal muscle fibres may influence how people respond to physical exercise. In general, how does physical exercise affect health, quality of life, and longevity? Group IV afferent fibers are not part of the muscle spindle. Bone tissue, or osseous tissue, is a hard, dense connective tissue that forms most of the adult skeleton, the internal support structure of the body. How does a muscle strain occur? A. Alpha-gamma coactivation This answer is INCORRECT. Three types of muscles are skeletal, smooth, and cardiac muscles. Give three reasons that muscle atrophy may occur.
They signal information about the static length of the muscle. Derive an expression for the power delivered to this wheel at this instant as a function of the system parameters.
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