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Muscular System
The muscular system allows humans to move. Muscles also provide strength, balance and heat.
11,239 Questions
A muscular contraction that causes a muscle to shorten as it develops tension is called?
A cramp is a sudden over-shortening of a muscle. Cramps are involuntary and, often, severe. They can be extremely painful.
How are muscles fiber arranged?
Strongly and effectively. An online encyclopedia/search engine with be able to give a clear definition with diagrams. Search for "muscle" or "muscle fibre" (not fiber!!)
What type of movement does the contraction of a flexor muscle?
Any flexor muscle decreases the angle of a joint. When you flex your biceps brachii, the distance between your forearm and arm becomes closer together. When you use your extensors on the same joint, your arm will straighten.
The end of the muscle that moves when a muscle contracts?
Histological Perspective
Both ends of the muscle are pulled together. This is because each muscle fiber is divided into contractile units called sarcomeres. Each sarcomere is composed of layers of thin and thick filaments, Actin and Myosinrespectively. The thick filaments, myosin, are located in the center of the sarcomere, a region called the A-Band. On either side of each A-Band, is a region called the I-Band. The I-Band is primarily composed of the thin filaments (Actin), although the thin filaments do overlap with the thick filaments within a sub region of the A-band called the zone of overlap.
As the muscle contracts the thick filaments pull the thin filaments together on either side, resulting in the apparent contraction of the muscle on both sides.
Gross Anatomical Perspective.
However, because a muscle is anchored at the origin of the stationary bone while its other end attaches at the insertion of the articulating bone and the net force of the contracting muscle pulls the insertion of the muscle to its origin.
It follows that: The correct answer is toward the origin.
What muscle extends and adducts the wrist?
If you are studying A&P using the Marieb & Mitchell 10th Ed the answer you are looking for is: Extensor carpi radialis longus (d) (found on page 216 in the Lab Manual)
Extensor Carpi Ulnaris <--Correct answer. Read below:
The first entry above is incorrect. The second answer (extensor carpi ulnaris) is correct. Read the question carefully: aDduct vs. aBduct. I teach from the Marieb & Hoehn 8th edition book, which confirms the second (correct) answer on p. 356, Table 10.11. Also, remember to answer the question assuming the body is in anatomical position, which places the ECU more medial than the ECR. Logic should lead one to the realization that contraction of the ECU muscle will move the wrist medially (aDduction). Likewise, contraction of the ECR (both longus and brevis) will move the wrist laterally (aBduction).
What contracts faster cardiac or skeletal muscle?
Cardiac. Think about it ur heartbeat is constantly contracting and releasing while ur skeletal muscle on ur arms can only go so fast
Which type of muscle is most frequent in your bodies?
Probably skeletal muscle but smooth muscle would be a close second.
What is the main components of the body muscles and bones?
The ten major bones in the human body are: the cranium (skull), mandible (lower jaw), vertebral column (spine), sternum (breast bone), ribs, pelvic girdle (pelvis), femurs, patella (knee cap), fibulae (upper part of lower arm) and phalanges (fingers and toes).
By Cassande
What muscle types has only one nucleus no sarcomeres and rare gap junctions?
Multi-unit Smooth Muscle.
What causes flaccid dysarthria?
The most common causes of spastic dysarthria include spastic cerebral palsy , multiple sclerosis , amyotrophic lateral sclerosis (ALS, or Lou Gehrig's disease), multiple strokes, and closed head injuries.
What are micro tears in muscle?
The destruction of the micro-filaments (actin, myosin) in a muscle cell that enable it to contract. The destruction of these filaments prevent the function of that muscle cell. A large amount of micro tears in a large amount of muscle cells contributes to the soreness present during weight training and is what triggers the body into producing stronger muscles.
Which muscle is involved in adduction at the ankle joint?
If you mean hyperadduction of the joint at the knee, it is stretching the muscle on the top of your thigh which is called the gastrocnemius.
A tendon is a tissue made up of collagen that is flexible and attaches muscle to bone. Tendons are very strong and inelastic.
What is the minimal level of stimulus to cause a muscle contraction?
it is known as the threshold stimulus
usually seen in tonic contraction
What type of muscle that can be contracted?
You have control over all striated skeletal muscles. You can not control smooth muscle fibers and cardiac muscle tissues.
What is unusual about cardiac muscle?
The muscle has unique features that are only in the heart.
These muscles are involuntary striated muscle which are only found in the wall of the heart. This is specialised muscle that can contract, Cardiac muscle, like other muscles, can contract, but it can also carry an action potential (i.e. conduct electricity), like the neurons that constitute nerves.
Furthermore, some of the cells have the ability to generate an action potential, known as cardiac muscle automaticity.
What exercise can do to make your muscles strong?
Swimming is a easy activity to get more muscle mass. Also running, such as track or cross country.
What allows us to consciously move or skeletal muscles?
Somatic, or voluntary, nerves connect to skeletal muscles refers to the conscious control of skeletal muscles.
What is the function of the brachii muscle?
The coracobrachialis muscle is involved with in the flexion and the adduction of the shoulder. That is to say, raising the arm and bringing the arm across the chest, respectively.
