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Muscular System
The muscular system allows humans to move. Muscles also provide strength, balance and heat.
11,239 Questions
Why would a muscular person run faster than a thin person?
a muscular man would run faster than a thin man because he physically built
What does an Isotropic band contain?
aka I-Band.
The Isotropic band is the section of a striated muscle sarcomere that contains only thin myofilaments. This band, along with the H zone decrease in length during muscle contraction.
What are the dangers of hitting your head and getting a big swollen bump on the right side?
The dangers? A concussion and permanent damage. Or it could just be a bruise. If the swelling and pain persist and are accompanied by other symptoms (like headaches or dizziness) call a doctor as soon as possible. ~ T
What are two experimental ways that the mode of stimulation can affect the muscle force?
Isotonic and Isometric Contractions
a battle between nations for advantage in the construction and growth
What happens if you have arthritis of the spine?
Most adults over 40 have radiographic evidence of arthritis of the spine and have no symptoms. It appears to be a common condition of aging.
It's a formal way of expressing regards, usually used in the beginning of formal "inter-departmental, ministerial, etc." letters. Extend here means give.
What is the medical name for the long back muscle?
spinal erectae. This muscle group flows up the backbone and is attached to each vertebra.
What are the main functions of the human heart?
It collects the blood returning from the body in the veins and sends it to the lungs.
Muscles are mainly composed of alternating rows of myosine protein filaments and actin protein filaments. When the muscle is relaxed those rows are least overlapped. When the nervous impulse commands the muscle to contract these rows overlap making the muscle shorter in length and causing a mechanical function.
The muscle contraction process first happens by a motor neuron being activated. This produces an action potential that passes outward in a ventral root of the spinal cord where it is conveyed to a motor end plate on each muscle fiber. The action potential causes the release of packets of acetylcholine into the synaptic clefts on the surface of the muscle fiber. The acetylcholine causes the electrical resting potential under the motor end plate to change, and this then initiates an action potential which passes in both directions along the surface of the muscle fiber. At the opening of each transverse tubule onto the muscle fiber surface, the action potential spreads inside the muscle fiber. At each point where a transverse tubule touches part of the sarcoplasmic reticulum, it causes the sarcoplasmic reticulum to release Ca+2 ions. The calcium ions result in movement of troponin and tropomyosin on their thin filaments, and this enables the myosin molecule heads to "grab and swivel" their way along the thin filament. This is the driving force of muscle contraction.
in order for a muscle fiber to contract there are several steps before getting a response. (obviously they happen at an unbelievable speed, so we don't notice it) but first the brain has to send a signal to the nerve, then an electrical impulse travels down the synaps, and Acetylcholine (ACh) is released into the synaps, and goes onto the sarcolema (but never touches) and binds to the ACh receptor cites, then the sarcoplasmic reticulum realeases calcium, and the calcium binds to troponin (top of actin) and troponin begins to change shape and tropomyosin slides off of the active cites and the cites then become available for myosin to bind on. Myosin then grabs onto Actin and ratchets head to slide actin forward, myosin goes all the way down the line and ratchets all of actin until the muscle fiber is completely contracted.
Read more: [[Q/How does muscle contract#ixzz161moMP5D|How_does_muscle_contract]]
When the frequency of stimulation of a muscle is great enough?
wave summation results and muscle twitches overlap.
How does sunlight become transformed to ATP in the muscles of a person?
Sunlight is transformed in NADPH and ATP in Plants. ("Photosynthesis")
They produce sugars, fats, proteins.
You eat plants, (or an animal, that ate plants), import the sugars, fats, proteins (as amino acids) into your body, break them down (sugars=glycolysis) into CO2 and energy.
You cannot transform sunlight into ATP except you are as green as Hulk....
A muscular valve is like a strong flap that is capable of opening and closing at will. An example of a muscular valve is the pyloric sphincter.
