Yes
YesYes
a muscle which crosses a single joint refers to a single joint muscle.
A flexor is a muscle that causes a joint to bend. In contrast, an extension is a muscle that straightens a joint.
Muscle Joint
No the flexor closes the joint.
Why do all muscle cross a joint? Define the attachment points of muscle to bone?
Probably the Biceps Brachii (commonly called Biceps).
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...
The deltoid muscle is the big muscle on the shoulder. It has three parts; the front or anterior, middle and back or posterior. It involves the shoulder joint.
If the muscle crosses a joint (most do), then the joint acts as a pivot.
This can be answered on several different levels, but let me take the simpliest.Major types of muscles:Skeletal - associated with bones - see more info below.Cardiac - muscle of the heart specializing in electrical communicationViseral or Smooth - lines all tubes and has the movement called peristalsisSkeletal Muscle movement associated with diarthritic joints: Hinge Joint - movement is extension or flexionCondyloid Joint - movement is pronation or supinationBall & Socket Joint - abduction & adduction are the first of many movements.Pivot Joint - movement is rotationAnd the list goes on. . . .
cartalige