Muscular System

There are 33 muscles in a human face. And no, it doesn't take more muscles to frown than to smile.

relative size of the muscle

The squat works many muscles in the body in some form. The primary movers are the hamstrings, quads, and glutes. Assuming you are doing them correctly with your knees out and squatting below parallel, you should be using your hip adductors as well.

The strongest indication that contractions are occurring in association with true labor is that the contractions begin to occur at regular intervals. This is contrary to Braxton-Hicks contractions, which are spontaneous, random uterine contractions that do not occur with actual labor.

The external anal sphincter is under voluntary control. You have the urge to defecate because your internal anal sphincter involuntarily opens, but you can keep yourself from going to the bathroom because your external anal sphincter is voluntarily closed. Hope that helps!

sartorius adductor muscle

=You use mostly all of your muscles in gymnastics!=

There is (mainly, in terms of movement) a ball-and-socket joint in the shoulder; a hinge joint in the elbow; and various joints inside the wrist which work together at different bones.

Yes, arrector pili muscles are associated with hair follicles. Arrector pili muscles are in the skin, connected to the hair follicles. Their job is to help maintain body homeostasis. When we are cold, the arrector pili muscles shorten, causing our hairs to stand up so that they block the cold and help keep heat from escaping. Although this is not very effective in humans because evolution has made us less hairy, this is great method for hairy animals to stay warm.

Now you know why we get "goosebumps" when we are cold! :)

By not taing care of your digestive system you riskk colon cancer and many other colon and intestine based disseases. People over thirty should get an average colonoscopy to check for polups.

There are many variables which contribute to a muscle's ability to produce force.

Architecture:

The Orientation of muscle fibers influence force production capabilities per square unit. For example, the diagonal orientation of the gastrocnemius (calve muscle) gives it greater ability to contract versus the linear orientation in the biceps brachii.

The way in which a muscle crosses one or more joints can give it a mechanical advantage relative to other muscles. The muscular system is essentially a lever system. Compare the moment arms between two muscles and you can see which one has the advantage

Physiology

Muscles are comprised of several motor units, some have the ability to contract faster and with more force than others. This is influenced by training and genetics. Muscles with more "Fast twitch" muscle can produce more force than "slow twitch" muscles. Think Olympic weightlifters versus endurance athletes.

A larger muscle generally has more contractile elements than a smaller one. This is also due to genetics and training. "Myofibrillar Hypertrophy" seen in barbell sports makes a stronger muscle than "Sarcoplasmic Hypertrophy" seen in bodybuilding. The former increases the actin and myosin within the muscle, the former increases the amount of water in the sarcoplasm.

It's somewhat erroneous to think of muscles as individual units. This is great for learning basics of anatomy, but in practice, muscles always work in concert with each other, interdigitate with each other and only really become separate under the scalpel.

To the best of my knowledge, three muscles attach to the bicipital groove of the Humerus: The Latissimus Dorsi, the Pectoralis Major and the Teres major. Marcel Fromond NMT Student

Several muscles work together to extend the thigh. the psoas major flexes and rotates the thigh medially, as does the iliacus. The gluteus maximus extends and rotates the thight laterally.

In addition, the adductor longus, adductor brevis, and adductor magnus help rotate, flex, and move the thigh.

the tounge is the stongest muscle in the body according to it's size

systole

Muscle contraction is affected by four factors:1. The number of muscle fibers stimulated

2. The relative size of the fibers

3. Frequency of stimulation

4. The degree of muscle strength

synergists: trapezius, teres major and minor, flexors, biceps brachii
antagonists: deltoid, extensors, triceps brachii

looking at the arms, it's the triceps and some portions of the deltoid.

Ligament

CONTRACTURE - commonly occuring in bedridden individuals...

smooth muscle is another involuntary muscle you cannot control, it is found in the walls of the internal organs and blood vessels, made up of sheets of cells that are ideally shape to form organs such as digestive tract and reproductive tract and they make up internal organs, smooth muscles are generally spherical, it is also contract slowly and can remain contracted for a long period of time without hiring, they have one nucleus.

Quadriceps muscle or thigh muscle.