bio exam
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- d
- d
- ddd
- d
- What are the functions of the muscular system?
- movement, posture, heat production
- skeletal muscle fibers contract due to signals sent to them by which type of neurons?
- motor
- which type or motor untit (lg or sm) has the ability to control fine movements? Which has greater strenth?
- small; large
- Which type of muscle is the most abundant in the body? and how much % body mass on avg?
- Skeletal muscle which includes connective, nervous and muscle tissue. 35-40%
- What is the order of the Skeletal Muscle Structure from LArgest to smallest?
- Muscle, Bundles, Fiber, Myofibril, Sarcomere, Actin, Myosin?
- What is the functional unit of the muscle system called?
- sarcomere
- Actin and myosin are..
- myofilaments
- Do actin and or mysosin contract (shorten)?
- no
- does the actin or does the myosin slide?
- actin
- During, muscle contraction, the msucle, the fiver, the myofibrils, the sarcomere shorten, but the myofilaments dont change in lenth. true or false.
- true
- The site where a motor neuron communicates with a muscle fiber is called.. It is a synapse
- neuromuscular junction
- Which type of neurotransmitter is released y all motor neurons?
- acetalcholine
- What chemical signal allows mysoin to bind to actin?
- calcium ions
- Is AtP required for muscle contraction. why?
- yes, it primes the mysoin head and allows the muscle to relax later.
- is atp required for muscle relaxation? y
- yes, allows muscle to relax after it contracts and absorbs CA
- Why does rigor mortis happen?
- lack of atp
- Muscle cells are excitable cells. true or false
- true
- Explain how botox works.
- paralyzes surface muscles, which reduces wrinkles, and smoooths the msucle
- Myasthenia gravis is an autoimmunde disorder in which the body attacks...
- muscle nerves, which causes muscle weakness
- Does myasthenia gravis result in cramps in lack of contractions?
- yes