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Summation and/or tetanic contraction. Summation is increased muscle contraction until maximal sustained contraction is achieved. Tetanic contraction is sustained muscle contraction without relaxation. If you're inquiring for the Learning Objective Review in an anatomy and physiology course, the question refers to a condition in which some fibers are always contracted... so I'm not sure if they're looking for summation or tetanic contraction - but I think it would be tetanic contraction as summation is more the process leading up to the tetanic contraction...
What else can I help you with?
What are the pennate muscles of the human body?
Some examples of pennate muscles in the human body include the deltoid muscle in the shoulder, the rectus femoris muscle in the thigh, and the flexor carpi ulnaris muscle in the forearm. These muscles have fibers that run obliquely to the tendon, which allows for greater force generation.
How does the structure and function of cardiac muscle compare to skeletal muscle?
Cardiac muscle and skeletal muscle have some similarities in structure and function, but also key differences. Both types of muscle are striated, meaning they have a striped appearance under a microscope. However, cardiac muscle is involuntary and found only in the heart, while skeletal muscle is voluntary and attached to bones to help with movement. Cardiac muscle has intercalated discs that allow for rapid communication between cells, while skeletal muscle fibers are individual cells. Additionally, cardiac muscle has a longer contraction time and does not fatigue easily, while skeletal muscle can contract quickly and tires more easily.
What are three processes that require a cell to expend energy?
Active transport, where cells move molecules against their concentration gradient. Protein synthesis, which involves the assembly of amino acids into new proteins. Muscle contraction, which requires energy to power the movement of muscle fibers.
The neuromuscular system is made up of the what?
The muscular system is made up of about 700 muscles in the body. It covers the Skeletal muscles, muscle types, head and neck muscles, back muscles, the thorax and abdominal muscles, pelvic floor muscles, perineum muscles, shoulder muscles, upper and lower extremity muscles.
What some examples of proprioceptors?
Proprioceptors are sensory nerve ending in muscles, tendons, and joints which respond to variations in movement, position, and tension. Muscle spindles proprioceptors sense changes in muscle length, Pacinian corpuscles are proprioceptor which detect changes in movement and pressure within the body, and the Golgi tendon organs, proprioceptors in the tendons near the end of muscle fibers, are sensitive to changes in muscle tension.
What is the state called where some of the fibers in particular muscle are always contracted?
summation
Are there such things as partially contracted muscle fibers?
That is very good question! You do not have any thing like partially contracted muscle fibres, most probably. What you have got is partially contracted muscles. The muscle is more or less contracted as per the number of muscle fibres that are contracted at any given time.
What does the all or none response mean dealing with muscles?
The All or None Muscle Theory is a theory that states that if said muscle is contracted, all of said muscle is contracted. In Essentials of Strength Training and Conditioning written by CSCS, they state,"There is no such thing as a motor neuron stimulus that causes only some of the fibers to contract."
Direction in which the muscle fibers run relative to some imaginary line?
These muscle fibers are said to be lateral.
What is the difference between tonus and tetanus?
1. Even when a muscle appears to be at rest, a certain amount of sustained contraction is occurring in its fibers. This is called muscle tone. (Muscle tone is a response to nerve impulses that originate repeatedly from the spinal cord and stimulate a few muscle fibers.) A tetanic contraction is when a forceful sustained contraction lacks even partial relaxation.
What is the theory of muscle growth where muscle fibers are able to split and create new fibers?
The theory of muscle growth that involves the splitting of muscle fibers is known as myofibrillar hypertrophy or fiber hyperplasia. This concept suggests that under certain conditions, such as intense resistance training, existing muscle fibers can split to form new fibers, contributing to overall muscle growth. While hypertrophy primarily results from the increase in the size of existing fibers, there is some debate within the scientific community regarding the extent to which hyperplasia occurs in humans. Most evidence supports that muscle growth primarily occurs through the enlargement of existing fibers rather than the significant formation of new fibers.
If your muscles are sore are you getting stronger?
Not really. You have torn some muscle fibers. If it is severe, the torn fibers will form scar tissue which is not muscle tissue. People hear the phase "no pain, no gain" but that is incorrect.
What are the 7 criteria that are used in naming muscles?
Action of the muscle Shape of the muscle Location of the muscle's origin and or insertion Number of origins Location of muscle relative to a bone or body region Direction in which the muscle fibers run relative to some imaginary line Relative size of the muscle
What do muscle fibers lose after fusion of myoblast?
After the fusion of myoblasts, muscle fibers lose their ability to divide and proliferate, as they become multinucleated and specialized for contraction. This process also leads to a reduction in certain cell organelles and the loss of some regulatory mechanisms associated with non-muscle cells, as the fibers focus on synthesizing proteins necessary for muscle function and repair. Additionally, they undergo changes in gene expression to support muscle-specific functions.
Identify and describe the appearance of the type of muscle tissue found in your heart?
The muscle type found in your heart is Cardiac, or Heart muscle. The muscle is a little wavey in the fibers, and has some holes, or cavities if you please.
Does muscle relaxers thin blood?
Muscle relaxers do not typically thin the blood. They primarily work by reducing muscle tension and spasms, affecting the central nervous system or directly targeting muscle fibers. However, some muscle relaxers may have side effects that could indirectly influence blood circulation. Always consult a healthcare professional for specific concerns regarding medications and their effects.
How can you get more fast twitch muscle fibers?
There is no proven way to gain muscle fibers. Some research has shown that through intense explosive exercises VERY FEW slow twitch fibers will be converted to fast twitch. Other research, shown only in ANIMAL testing, has suggested that super high weight and low rep (1-3) will actually CREATE NEW fast twitch muscle fibers. But your pre-existing fast twitch muscle fibers can gain massive increases in size through explosive exercises. Examples of these exercises would be sprints, high weight low rep resistance training, and Olympic lifts. Remember, there is no proven way for HUMANS to actually gain new muscle fibers.
