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Muscular System
The muscular system allows humans to move. Muscles also provide strength, balance and heat.
11,239 Questions
What is the function of the rectus femoris muscle?
Rectus Femoris is a quadricep muscle located in the anterior thigh, on top of the vastus intermedius (another quadricep). All of the quadriceps insert to the patella, and the tibial tuberosity via the patellar ligament. Together they are responsible for extension of the knee. Rectus Femoris is the only quadricep that also crosses the hip joint (acetabulofemoral joint) and attaches to the AIIS (anterior inferior iliac spine). Because of this, Rectus Femoris also assists in flexion of the hip.
What is the primary role of muscle spindles?
the striated portions of the intrafusal fiber contract to keep the spindle taut at different muscle lengths. If the whole muscle is stretched, the muscle spindle is also stretched, triggering sensory nerve impulses on its nerve fiber. These sensory fibers synapse in the spinal chord with lower motor neurons leading back to the same muscle. Impulses triggered by stretch of the muscle spindle contract the skeletal muscle.
What is an Activity that combines muscle contraction with repeated movement?
An activity that combines muscle contraction with repeated movement is Isotonic execrise
Do Africans have an extra calf muscle?
No. Africans have the same number of muscles as any other race.
What bone is located under the bicep?
The tricept is located under the bicept.
Sorry, however the tricep is just the muscle at the lower arm.
The bone under the bicep is the humerus.
***If you are asking this for the answer to a crossword puzzle, the correct answer is ULNA***
What is the function of the muscle in the stomach?
It contractS and relaxes to churn the food and mix it with the bile and other digestive enzymes.
Gap between axon terminal and muscle cell?
The gap between the axon terminal and muscle cell is called the synaptic cleft. It is defined as the small gap, measured in nanometers, between an axon terminal and any of the cell membranes in the immediate vicinity.
What is the best way to work out?
it just depends on whether you're trying to lose weight,body build,or get ripped. losing weight calls for lots and lots or cardio (walking,running,dieting,crunches,and light weight lifting.) building muscle calls for a high protein diet and working out every 3 days or so and you also have to do a little cardio to keep the protein from turning into fat. getting ripped is probably the hardest and the easiest at the same time it requires massive amounts of protein and at least what i did after i got through body building a ton of med weight weights workouts like instead of straining your butt out you do 20 bench-presses instead of 8 hard ones. and id say do it at least 4 times a week. It also requires some cardio as well because if your doing 2 hours of workouts a day your body requires massive protein and you don't want to gain weight you want to lose it but you also don't want to burn all the protein off and lose all your muscle.
Where is the position of erector pilli muscles?
Right next to the bottom of a hair in the dermis layer of the skin. (It's not in the hair of the head or the private parts).
Which muscles allow you to flare your fingers?
The muscles which allow you to extend your wrist and flare your fingers are the flexor muscles in the wrist and the prime movers in the fingers. These muscles will coordinate to adduct the wrist and the fingers.
Delayed relaxation of a muscle is called?
Myotonia is a delayed relation of a muscle after a strong relaxation or the inability to relax voluntary muscle after vigorous effort. It can affect any muscle group. Repeated effort will be needed to relax the muscle, although the condition usually improves after the muscles have warmed-up.
Sperm cells have the smallest diameter of the cells mentioned if measuring at the head. However, the flagellum makes the cell appear very long.
What is the waste that collects in the muscles?
Carbon dioxide, lactic acid, carbonic acid, and phosphoric acid. Most of these are removed via the blood/lungs.
Lactate is the base of lactic acid. Lactic acid is the substance the can accumulate in response to physical exercise. Lactate is removed from the muscle over time. But according to a certain website I found, "lactic acid is not a waste product."
When your muscles shorten this is called what?
This is due to contraction of the biceps, and is known as flexion.
What are the group of muscles located on the posterior thigh?
the posterior is the 'back' (as opposed to the front) of the body. you might want to refine your question
When muscle receives a nerve signal it and pulls on a tendon?
The muscle responds and pulls on a bone by way of a tendon. It can not react until the nerve tells it to.
- The alpha motor neuron produces an action potential that propagates down its axon to the neuromuscular junction.
- The action potential is sensed by a voltage-dependent calcium channel which causes an influx of Ca2+ ions which causes exocytosis of synaptic vesicles containing acetylcholine.
- Acetylcholine diffuses across the synapse and binds to nicotinic acetylcholine receptors on the myocyte, which causes an influx of Na+ and an efflux of K+ and generation of an end-plate potential.
- The end-plate potential propagates throughout the myocyte's sarcolemma and into the T-tubule system.
- The T-tubule contains dihydropyridine receptors which are voltage-dependent calcium channels and are activated by the action potential.
- The dihydropyridine receptors transmit the voltage-mediated signal through a mechanical linkage to the ryanodine receptors in the sarcoplasmic reticulum.
- Ryanodine receptors undergo a conformational change that opens their channel.
- Opening of the Ryanodine receptors causes and flow of Ca2+ from the sarcoplasmic reticulum into the cytoplasm. In this release, Ca2+ unbinds from the calcium-binding protein called calsequestrin.
- Ca2+ released from the sarcoplasmic reticulum binds to Troponin C on actin filaments, which subsequently leads to the troponin complex being physically moved aside to uncover cross-bridge binding sites on the actin filament.
- By hydrolyzing ATP, myosin forms a cross bridges with the actin filaments, and pulls the actin toward the center of the sarcomere resulting in contraction of the sarcomere.
- Activation of the cross-bridge cycling may induce a shortening of the sarcomeres and the muscle as a whole, but not if the tension is insufficient to overcome the load imparted on the muscle.
- Simultaneously, the sarco/endoplasmic reticulum Ca2+-ATPase actively pumps Ca2+ back into the sarcoplasmic reticulum where Ca2+ rebinds to calsequestrin.
- With Ca2+ no longer bound to troponin C, the troponin complex slips back to its blocking position over the binding sites on actin.
- Since cross-bridge cycling is ceasing then the load on the muscle causes the inactive sarcomeres to lengthen.
In cardiac muscle, the method is dependent on a phenomenon called calcium-induced calcium release, which involves the conduction of calcium ions into the cell triggering further release of ions into the cytoplasm (about 75% of calcium present in the cytoplasm during contraction is release from the sarcoplasmic reticulum).
- An action potential is induced by pacemaker cells in the Sinoatrial node or Atrioventricular node and conducted from non-contractile cardiac myocytes to contractile cells through gap junctions.
- The action potential triggers L-type calcium channels during the plateau phase of the cardiac action potential, causing a net flux of calcium ions into the cardiac myocyte.
- The increase in intracellular calcium ions is detected by ryanodine receptors in the membrane of the sarcoplasmic reticulum which transport calcium out into the cytosol in a positive feedback physiological response.
- The cytoplasmic calcium binds to Troponin C, moving the troponin complex off the actin binding site allowing the myosin head to bind to the actin filament.
- Using ATP hydrolysis the myosin head pulls the actin filament to the centre of the sarcomere.
- Intracellular calcium is taken up by the sarco/endoplasmic reticulum ATPase pump into the sarcoplasm, or ejected from the cell by the sodium-calcium exchanger or the plasma membrane calcium ATPase.
- Intracellular calcium concentration drops and troponin complex returns over the active site of the actin filament, ending contraction.
When a muscle is relaxed are there only thin filaments in the center of the sarcomere?
Yep, you got it.
What are the muscles in the adomen lower back pelvic or buttocks region called?
The spine is bordered by several groups of muscles, including the intertransversarii muscle which facilitate movement between the individual vertabrae, and the multifidus spinae, which facilitate the movement of the spine as a whole. Other muscles in the back are associated with the movement of the neck and shoulders. The trapezius muscle, which is named from its trapezium-like shape, runs between the neck, the anterior chain, the two shoulders, and the thoracic vertebra, T12. The large latissimus dorsi make a triangle from the shoulder to the hip.
Orbicularis oculi is part of the eye that works your eyelids. This is a muscle in the face.
How are muscles affected by sports?
muscels are affected by sports because when you play a sport you are strengthening your muscels. When ever you excercise you are ripping your muscles to increase their strenghth (this is where the phrase "your ripped" comes from). When you strengthen your muscels it takes a lot more time for lactic acid to build up. Lactic acid is why you ache the next day after you have worked out, but ripping your muscels adds to the pain. The more tough your muscels are the less lactic acid builds up!!!
Cerebellum
yes and no it is a muscle but its like any other muscles when you flex your arm your bicep shows
