An antagonist is a kind of muscle that acts in opposition to the movement generated by the agonist and is responsible for returning a limb to its initial position. A top-down view of skeletal muscle Muscle (from Latin musculus little mouse [1]) is contractile tissue of the body and is derived from the mesodermal layer of embryonic germ cells. ... Agonist is kind of muscle that causes movement to occur. ...

Antagonistic pairs in houses

These antagonistic muscles are found in pairs called antagonistic pairs. These consist of an extensor muscle, which "opens" the joint (i.e. increasing the angle between the two bones), and a flexor muscle, which does the opposite to an extensor muscle. An extensor muscle is any skeletal muscle that opens a joint increasing the angle between components of a limb, such as straightening the knee or elbow and bending the wrist or spine. ... A flexor muscle is a skeletal muscle whose contraction bends a joint, decreasing the angle between components of a limb, such as bending the knee or elbow. ... An extensor muscle is any skeletal muscle that opens a joint increasing the angle between components of a limb, such as straightening the knee or elbow and bending the wrist or spine. ...

Antagonistic pairs are needed in the body because muscles can only exert a pulling force, and can't push themselves back into their original positions. An example of this kind of muscle pairing is the biceps and triceps. Look up Biceps in Wiktionary, the free dictionary. ... The triceps brachii muscle is a large three-headed skeletal muscle found in humans. ...

When the biceps is contracting, the triceps is relaxed, and is able to be stretched back to its original position. This is the opposite when the triceps is contracting.

Lombard's Paradox

When you stand up from a sitting position, both the hamstrings and quadriceps contract at the same time. There are very few or no other articles that link to this one. ... In human anatomy, the hamstrings are a group of muscles on the underside (posterior aspect) of the thigh. ... Muscles of the iliac and anterior femoral regions. ...

The Rectus Femoris biarticular muscle acting over the hip, when compared to the hamstrings has a smaller hip movement arm. But, the rectus femoris movement arm is greater over the knee, than the hamstring's knee movement. This means that contraction from both rectus femoris and hamstrings will result in hip extension, and knee extension. Hip extension will also add a passive stretch component to the Rectus Femoris, and will result in a knee extension force. This "paradox" allows for efficient movement especially during gait.[1]

See also

• Hering's law of equal innervation
• Sherrington's law of reciprocal innervation

Herrings law of equal innervation is used to explain the conjugacy of eye movements (saccades) in stereoptic animals. ... Sherringtons law of reciprocal innervation states that for every neural activation of a muscle, there is a corresponding inhibition of the opposing muscle. ...

External links

• Examples of antagonists
• Examples of antagonists

More links

this is not helping me SO SHUT UP For other uses, see Joint (disambiguation). ... In Amphiarthroses (slightly movable articulations), the contiguous bony surfaces are either: symphysis: connected by broad flattened disks of fibrocartilage, of a more or less complex structure, as in the articulations between the bodies of the vertebrae. ... A symphysis is a fibrocartilaginous fusion between two bones. ... The permanent teeth, viewed from the right . Gomphosis is the external layer of Gomphoses is where the teeth are anchored in place in a timely manor. ... Synovial joints (or diarthroses, or diarthroidal joints) are the most common and most moveable type of joints in the body. ... A joint is the location at which two bones make contact. ... Pivot joint (trochoid joint, rotary joint): Where the movement is limited to rotation, the joint is formed by a pivot-like process turning within a ring, or a ring on a pivot, the ring being formed partly of bone, partly of ligament. ... In a condyloid joint (condyloid articulation, ellipsoidal joint) an ovoid articular surface, or condyle, is received into an elliptical cavity in such a manner as to permit of flexion, extension, adduction, abduction, and circumduction, but no axial rotation. ... In a saddle joint (sellar joint, articulation by reciprocal reception) the opposing surfaces are reciprocally concavo-convex. ... A ball and socket joint (enarthrosis, spheroidal joint) is a joint in which the distal bone is capable of motion around an indefinite number of axes, which have one common center. ... A gliding joint (arthrodial joint, plane articulation) is a joint which admits of only gliding movement. ... Kinesiology is the scientific study of human movement. ... It has been suggested that Kinesiology#Motions be merged into this article or section. ... Agonist is kind of muscle that causes movement to occur. ... In anatomy, Flexion is movement whereby bones or other objects are brought closer together. ... The leg extension is an isolation exercise. ... In anatomy and physiology, adduction is the moving of limbs towards the midline of the body. ... Abduction, in functional anatomy, is a movement which draws a limb away from the median plane of the body. ... In anatomy, internal rotation (also known as medial rotation) is rotation towards the center of the body. ... External rotation (or lateral rotation) is rotation away from the center of the body. ... In human and zoological anatomy (sometimes called zootomy), several terms are used to describe the location of organs and other structures in the body of bilateral animals. ... In human and zoological anatomy (sometimes called zootomy), several terms are used to describe the location of organs and other structures in the body of bilateral animals. ... Peronaeus longus and peronaeus brevis labeled at bottom left. ... In zootomy, several terms are used to describe the location of organs and other structures in the body of bilateral animals. ... Peroneus longus and peroneus brevis labeled at center left. ... Tibialis anterior and posterior labeled at center top. ... Elevation is the anatomical term of motion for movement in a superior direction. ... Depression is the anatomical term of motion for movement in an inferior direction. ... An anatomical term for a anterior movement on the horzontal plane. ... Retraction is the anatomical term of motion for posterior movement of the arms at the shoulders. ...