Treatment can range from exercise to surgery. The muscular system is the organ system that consists of all the muscles in the body. Muscular system anatomy and physiology quiz. The combination of an individual motor neuron and all of the muscle fibers that it innervates is called a motor unit. Chapter 8: Muscular System. Proprioception is the sense of the body's position in space based on specialized receptors that reside in the muscles and tendons. 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.
- Chapter 6 the muscular system answer key
- Muscular system questions and answers pdf
- Muscular system anatomy and physiology quiz
- Muscular system worksheet pdf answer key
- Muscular system worksheet answer key
Chapter 6 The Muscular System Answer Key
Where is smooth muscle found? Name a muscular system disorder involving tendons. These fibers are anatomically similar to the static nuclear bag fibers, but they signal primarily information about the rate of change (velocity) of muscle length. E. Gamma motor neurons This answer is INCORRECT. A. Alpha-gamma coactivation This answer is INCORRECT. Because they innervate all 3 types of intrafusal fibers, Group Ia afferents provide information about both length and velocity. C. - D. - E. Types of fibers contained within muscle spindles include... A. Why does this orderly recruitment occur? Muscular system questions and answers pdf. Although many of the details are not understood, two broad principles appear to be key concepts toward understanding motor control: - Functional Segregation. When you move you can feel how your bones support you, facilitate your movement, and protect the soft organs of your body. How does a muscle strain occur?
These fibers are so-named because their nuclei are collected in a bundle in the middle of the fiber. Nuclear Chain fibers. Muscular system worksheet answer key. How would your analysis differ if there were many many buckets on the wheel so that the jet was continually striking at least one bucket? These unconscious processes allow higher-order brain areas to concern themselves with broad desires and goals, rather than low-level implementations of movements. What is the function of mitochondria in muscle cells?
Muscular System Questions And Answers Pdf
The unique connective tissue that fills the interior of most bones is referred to as bone marrow. 4), and all motor neurons that innervate a particular muscle are contained in the same motor neuron pool. Muscle force is controlled in part by... A. Alpha-gamma coactivation. 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. Four characteristic signs of the disorder are muscle tremor, rigidity, slowness of movement, and postural instability. Answer the following questions about these arm muscles. 5 Physical Exercise: Review Questions and Answers. If the acetylcholine receptors on muscle fibres were blocked by a drug, what do you think this would do to muscle contraction? Mineral and Fat Storage, Blood Cell Formation. A motor neuron controls the amount of force that is exerted by muscle fibers. Thus, when the CNS instructs a muscle to contract, it not only sends the appropriate signals to the alpha motor neurons, it also instructs gamma motor neurons to contract the intrafusal fibers appropriately; this coordinated process is referred to as alpha-gamma coactivation.
The Ib fibers do not change appreciably, because the balloon does not add much load to the muscle. Define neuromuscular disorders. Organ system composed of bones, cartilage and ligaments that provides for movement, support, protection, mineral and fat storage, blood cells formation. Connective tissue in the interior cavity of a bone where fat is stored. What mechanism may underlie many of the general health benefits of physical exercise? When force is applied to a muscle, the Golgi tendon organ is stretched, causing the collagen fibers to squeeze and distort the membranes of the primary afferent sensory endings. Some orthopedic problems can be treated with medications, exercises, braces, and other devices, but others may be best treated with surgery (Figure 6.
Muscular System Anatomy And Physiology Quiz
One of the major principles of the motor system is that motor control requires sensory input to accurately plan and execute movements. A strained muscle is caused by the tearing of muscle fibres. Connective tissue in the interior cavity of a bone where blood cell formation (hematopoiesis) takes place. Both muscle fibres and myocytes are muscle cells. 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. Can too much physical exercise be harmful? Identify three types of muscle tissue and where each type is found. 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. A muscle strain occurs when muscle fibres tear as a result of overstretching. Suppose your osseous tissue could not store calcium. There are 3 types of muscle spindle fibers, characterized by their shape and the type of information they convey (Figure 1. 10 Sensory Innervation of Muscle Spindles.
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. What are musculoskeletal disorders? Body Part Muscle Flashcards and use them to practice naming muscles. 3 Types of Muscle Tissue: Review Questions and Answers. First-aid steps for treating musculoskeletal disorders such as muscle strains and tendinitis include protection, rest, ice, compression, and elevation. As shown in Figure 1. 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.
Muscular System Worksheet Pdf Answer Key
Physical exercise can reduce risk factors for cardiovascular disease, including hypertension, high levels of "bad" and total cholesterol, and excess body weight. The muscle spindle signals the length of a muscle and changes in the length of a muscle. The spinal cord also contains complex circuitry for such rhythmic behaviors as walking. What are possible causes of muscle hypertrophy? Group IV afferent fibers are not part of the muscle spindle. What is the difference between primary and secondary Parkinson's disease? Positive benefits of physical exercise on cognition may be explained by an increase in blood flow to the brain, which brings more oxygen to brain cells; an increase in growth factors that promote growth of brain cells and neuronal pathways in the brain; and an increase in neurotransmitters in the brain. If the triceps were to then contract, which way would the arm move? Calcium ions, for example, are essential for muscle contractions and are involved in the transmission of nerve impulses.
Because of the fusiform shape of the muscle spindle, these fibers are referred to as intrafusal fibers. These sensory fibers have stretch receptors that open and close as a function of the length of the intrafusal fiber. The number of fibers innervated by a motor unit is called its innervation ratio. These areas are located throughout the nervous system. The sliding filament theory is the most widely accepted explanation for how a muscle contraction occurs.
Muscular System Worksheet Answer Key
Hard, dense connective tissue that forms the structural elements of the skeleton. As a result, the afferent is depolarized, and it fires action potentials to signal the amount of force. Relate muscle fibre structure to the functional units of muscle fibre consists of a bundle of myofibrils, which are bundles of protein filaments. The term myocyte is mainly used to describe muscle cells in smooth muscles. It is the site where motor neurons are located.
Please read our Terms of Use and Privacy Notice before you. Three types of muscles are skeletal, smooth, and cardiac muscles. In summary, - Muscle spindles signal information about the length and velocity of a muscle. Moreover, different types of muscle fibers are innervated by small and larger motor neurons. 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. How do we define physical exercise? Even though the motor system is composed of many different types of neurons scattered throughout the CNS, the motor neuron is the only way in which the motor system can communicate with the muscles.