Why do all muscle cross a joint? Define the attachment points of muscle to bone?
I think its the tongue
If you're talking about moving the joint, either the muscle or the tendon does. There are plenty of muscles that aren't involved with a joint, such as the heart muscle, facial muscles, stomach and intestines...
Muscles contract and relax to move a joint. ... Muscles contract at a constant rate. Muscles contract and relax to move a joint.
1. All muscles cross at least one joint. 2. Typically, the bulk of muscle lies proximal to the joint crossed. 3. During contraction, the muscle insertion moves toward the origin. 4. All muscles have at least two attachments (origin and insertion). 5. Muscles always pull, they never push.
The muscles around the pivot joint are the Quadricep and the Hamstring muscles.
receptors lying in joint and muscles
Core muscles are in your core joint muscles are in your arms and legs
Duplex cross joint
Muscles that bend a joint are flexors; musces that straighten a joint are extensors.
Opposing muscles use connective tissues to cause movement in a joint.
Two joint muscles in the upper limb is the wrist and the elbow. Two joint muscles in the lower limb is the ankle and the knee.
When a joint is bent, the muscles around that joint contract and shorten. This causes the joint to move, resulting in the bending or flexing of the joint. The specific muscles involved and the degree of contraction depend on the joint and the movement being performed.