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Muscular System
The muscular system allows humans to move. Muscles also provide strength, balance and heat.
11,239 Questions
Is the neck a voluntary or involuntary muscle?
neck muscle is voluntary muscle
i think this is correct
What effects does aging have on muscle tissue?
As people age, their skeletal muscle mass starts to deteriorate. Your skeletal muscles (also known as lean muscle) are the muscles that attach to your bones and are under voluntary control.
As a result of deterioration, people begin to look, well, flabby as they get older. You may see these changes start as early as your 30s, but most people see the biggest changes between their 40s and 50s.
Do you have muscles in your face?
Since you can move parts of your face independently (eyebrows, eyes, nose, lips, etc.), the answer is yes. Since you can move parts of your face independently (eyebrows, eyes, nose, lips, etc.), the answer is yes.
How long can anaerobic respiration sustain maximum muscle activity?
Skeletal muscle fibers can get ATP from 3 sources:
-Phosphagen system (a few seconds)
-Anaerobic fermentation (less than 2 minutes)
-Aerobic respiration (indefinite)
What does not belong excitability response to stimulus contractility action potential?
Excitability! cha cha!
How does the skeletal and muscalar system work together?
The muscular system enables movement of the skeletal system while the skeletal system provides structure for the muscular system.
What actions are caused by skeletal muscles?
The actions skeletal muscles can perform are: flexion, extension, abduction, adduction, rotation, elevation, and depression.
What are the special features of the smooth muscle?
Smooth muscle cells range from 5 to 10 µm in diameter and from 30 to 200 µm in length. Each cell is spindle-shaped and has a single, centrally located nucleus. Figure 10-22a shows typical smooth muscle fibers as seen by light microscopy, and Figure 10-22b shows diagrammatic views of relaxed and contracted smooth muscle cells.
Smooth muscle tissue occurs within almost every organ, forming sheets, bundles, or sheaths around other tissues. Smooth muscles around blood vessels regulate blood flow through vital organs. In the digestive and urinary systems, rings of smooth muscle, called sphincters, regulate the movement of materials along internal passageways. Smooth muscles in bundles, layers, or sheets play a variety of other roles:
- Integumentary system. Smooth muscles around blood vessels regulate the flow of blood to the superficial dermis; smooth muscles of the arrector pili elevate hairs.
- Cardiovascular system. Smooth muscles encircling blood vessels control the distribution of blood and help regulate blood pressure.
- Respiratory system. Smooth muscle contraction or relaxation alters the diameters of the respiratory passageways and changes the resistance to airflow.
- Digestive system. Extensive layers of smooth muscle in the walls of the digestive tract play an essential role in moving materials along the tract. Smooth muscle in the walls of the gallbladder contract to eject bile into the digestive tract.
- Urinary system. Smooth muscle tissue in the walls of small blood vessels alters the rate of filtration at the kidneys. Layers of smooth muscle in the walls of the ureters transport urine to the urinary bladder; the contraction of the smooth muscle in the wall of the urinary bladder forces urine out of the body.
- Reproductive system. Layers of smooth muscle help move sperm along the reproductive tract in males and cause the ejection of glandular secretions from the accessory glands into the reproductive tract. In females, layers of smooth muscle help move oocytes (and perhaps sperm) along the reproductive tract, and contraction of the smooth muscle in the walls of the uterus expels the fetus at delivery
Why do you need both biceps and triceps to move the lower arm up and down at the elbow?
Because muscles can not push, they can only pull (contract). So while your biceps contract to pull the arm up into a flexed position; the triceps are necessary to pull the arm back down into an extended position. Skeletal muscles or groups of skeletal muscles must work in pairs. These pairs are called "antagonistic" muscles; while one group is contracting, the other group is relaxing.
You can easily feel this action in your arm. With your right arm extended, place you left hand on your right biceps. Flex your arm (as if to make a big muscle) and you will feel the biceps brachii tighten and bulge somewhat; we are familiar with this. Now, place your left hand on your triceps and straighten the right arm completely (extra straight) and you should be able to feel the triceps brachii tighten. Although aided by gravity, the triceps MUST contract to straighten the arm.
How can you work out the rectus abdominis muscle?
The Transversalis abdominus can be worked out with tummy tuck, planks, plank with leg lifts and transverse pulls. The single most effective exercise to isolate this area is the stomach vacuum.
Which body parts provide the effort when bones act like levers?
The muscles would provide the extra effort because the muscles are like extra foundations moving your body around.
How does the heart's ability to contract differ from that of other muscles?
Because the heart isn't used to move something, such as your arm or leg. The build up of a skeletal muscle is longer and thinner, in places. The heart has two hollow chambers, the left and right. The heart beats, other muscles don't.
What are the origins and insertions of the quadriceps group?
The "quadriceps" are made up of four muscles; Rectus Femoris, Vastus Medialis, Vastus Lateralis, and Vastus Intermedius. They all insert into the Tibial tuberosity (small bump on the upper tibia) but their origins differ. Rectus Femoris originates from the anterior inferior iliac spine (bump on the ilium). Vastus medialis, lateralis, and intermedius originate from the upper shaft of the femur.
bulimia / anorexia - eating disroders, women are more affected than men by a 9 : 1 ratio.
chronic dieting - women tend to diet significantly mroe than men do.
muscle dysmorphia - can affect both men and women equally.
Is there a link between genetics and muscle fiber types?
Most definitely. There is a link between genetics and nearly every characteristic of organic anatomy. Genetics tells all of our chemistry how to work together, not just specific things. The only things considered unaffected by genetics are environmental effects. Someone may have no hair because they have a genetic defect, or they may have just shaven it all off.
What is Peripapillary atrophy bilaterally?
Atrophy in general is the death of the normal body tissue. Papillary is the optic disc in the eye. Perpapillary atrophy therefore is the dying of the retinal tissue immediately next to the optic disc. This can occur in a number of conditions such as glaucoma etc.
