1. Troponin and Tropomyosin are integral proteins that determine muscle fiber al
ID: 3514984 • Letter: 1
Question
1. Troponin and Tropomyosin are integral proteins that determine muscle fiber alignment? a. True b. False 2. In our discussion of the peripheral nervous system, which two neural components (nerves) make up the PNS? a. Motor unit recruitment and nerve thickness b. Dendrite and Axon c. Acetylcholine and Norepinephrine neurotransmitters that are released from nerves d. Afferent and Efferent Neurons 3. Which muscle fiber type is mostly active during light exercise? a. Type lla b. Type llx c. Type I d. All fibers are activated during light exercise Which of the following autonomic nervous system branches has dominate control over your heart rate at rest? 4. a. Sympathetic fibers b. Parasympathetic fibers (vagus nerve) C. Somatic fibers d. Afferent neuronsExplanation / Answer
1. False.
The proteins which determine the fibre alignment are titan, alpha-actin, myomesin, nebulin and dystrophin. The troponin and tropomycin regulate the muscle contraction.
2. d. Afferent and Efferent neurons.
PNS lies outside the CNS. PNS consists of 2 neurons , 1. Afferent (Sensory) and 2. Efferent (Motor). Afferent carry information from nerves to the CNS.
Efferent carry information from CNS to muscle fibers throughout the body.
Dendrite and axon are the parts of a neuron.
3. c. Type I
The human body has 3 types of muscles. Type I, type IIA, and type IIX. The type I is involved in low intensity light exercises. As the intensity of exercise changes to hard and power the type II muscles get involved.
4. b. Parasympathetic fibres (vagus nerve)
The heart rate is controlled by autonomous nervous system using two components. : sympathetic and parasympathetic nerves. At rest, the parasympathetic system using its vagus nerve regulates the heart rate.
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