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Muscular System
The muscular system allows humans to move. Muscles also provide strength, balance and heat.
11,239 Questions
What happens in each of the five phases of cardiac muscle depolarization?
PHASE0(RAPID DEPOLARIZATION)
due to opening of fast voltage gated sodium channels
PHASE1(INITIAL REPOLARIZATION)
due to closure of sodium channels while loss of potassium is goingon ,making the cell polarized.
PHASE2(PLATEAU)
due to opening of calcium channels. influx of calcium neutralizes the effect of out going potassium so prolonged plateau is achieved.
PHASE3(FINAL RE POLARIZATION)
due to closure of calcium channels and continue loss of potassium makes the inside of cell more negative resulting in polarization.
PHASE4(RMP)
eventually cell returns to resting membrane potential due to K efflux and cell is ready for next cycle
How do you test a biceps reflex?
The triceps muscle reflex can be performed as follows:
1. The patient's upper arm is abducted (extended out to the side - away from the body)
2. The forearm is allowed to hang toward the floor.
3. The tendons which attach the triceps muscle to the elbow joint should be facing basically upward (toward the ceiling) at this point. These tendons can be identified by pressing near the elbow joint and feeling for the "rubbery" cord-like structures.
4. Place the finger firmly against one of these tendons, then strike the finger digit with the reflex hammer.
5. Watch for the hanging hand to move away from the body slightly. This is the reflex.
What is origin and insertion of muscle?
an origin is where the muscle attaches to the bone, it also attaches on another bone, this is called the insertion, the attachment where the bone moves is the insertion, the attachment where the bone does not move is the origin.
Do you apply heat or ice to a pulled muscle?
You always ice muscle, tendon, and ligament damage to prevent swelling and further potential damage.
It used to be that after the first day or two after an injury, you would apply heat to bring healing blood circulation to the area.
It has been found in the past couple of years that ice is somewhat better at bringing healing blood to the damaged area. Either heat or cold will be OK to apply after the first day or two after the injury.
What 2 substances need To be supplied to muscles constantly during exercise?
Organs
oxygen
Food
Water
Energy
allows your ribs to move up and down when you breath
the intercostal muscles contract.these pull the ribcage upwards.so the chest increases in volume when we breath out the intercostal muscles relax which lowers the ribcage.the chest decreases in volume see the diagram below for help
The intercostal muscles are located between the ribs and they lift the diaphragm allowing oxygen to flow in and out of the lungs. Basically, they aid in breathing.
A muscle cell is most correctly referred to as?
Muscle cells are most correctly referred to as muscle fibers.
Why does rigor mortis develop?
Rigor morits takes place mostly because the muscles cannot relax after someone dies. The bones in a person's body start to actually contract within themselves and the skeletal muscles start to do the same.
What happens to the biceps and triceps as you raise the forearm?
when you bend your arm, your biceps contract, or tighten, and your triceps retract, or loosen. When you straighten your arm in a relaxed position, your triceps contract, and your biceps retract.
What muscle controls the scrotum closeness to the body?
The testes have to be kept at a constant temperature, a bit below the body temperature. In Winter, the testes will move closer to the body to keep warm, whilst in Summer they will move away to keep cool! Weird huh? It's almost like they have a brain of their own.
Why do your Muscles have bumps on them and sore?
What I do know it that I am experiencing the same after doing some serious sport two nights ago and the "surface" of my left calf muscle seem to have bumps which are quite sore when I run my fingers over them.
Well if you think of your penis, once you start to get a boner, you cant stop it, the muscles are getting harder and harder and cant be stopped
Yes, that is true.
How are skeletal muscles attached to bones?
The human body has more than 650 muscles, which make up half of a person's body weight. They are connected to bones by tough, cord-like tissues called tendons, which allow the muscles to pull on bones.
Why do arteries have more smooth muscle than vei?
capillaries by definition don't have any smooth muscle in their walls. They are simply made of one layer of endothelial cells.
The iris is composed primarily of two smooth muscle layers?
the radial fibers contract,enlarging the pupil and allowing more light to enter the eye
Why are tendons important to a muscles ability to make the body move in a chicken wing?
Tendons connect muscles to bone.
What type of muscle tissue makes up wall of heart?
Cardiac muscle tissue forms the walls of the heart.
How can muscles work in pairs?
ussually, one muscle in the pair bends part of the body.the other muscle straightens part of the body.
