Which of the following is not correct about the knee-jerk reflex? Select one: A. It involves interneurons in the spinal cord B. It involves afferent neurons C. It involves autonomic nervous system responses D. It involves the quadriceps, large skeletal muscles in the upper leg E. It involves efferent neurons

The reflex arc is the fastest way the body has to move a body part from danger or away from the source of pain. Have you ever noticed your own reflex response? Did you notice that you felt the pain after you yanked your hand away from the source of pain? Which is the sequence of structures involved in a reflex response? a. motor neurons → effectors → brain → sensory neurons → interneurons b. effectors → sensory neurons → brain → motor neurons c. sensory neurons → interneurons → motor neurons → effectors d. sensory neurons → motor neurons → interneurons → effectors

Please order the steps of voluntary movement. 1) Primary motor cortex sends information to alpha motor neurons 2) The prefrontal and parietal cortices decide to initiate movement. 3) Alpha motor neurons initiate muscle contractions. 4) The supplementary motor area (SMA) uses input from the thalamus and basal ganglia to plan a movement.

What do the two main proprioceptors in muscles respond to? Select one: a. The golgi tendon organ and the spindles both respond to both changes in muscle length and muscle tension b. The golgi tendon organ responds to changes in muscle length, the spindles respond to changes in muscle tension c. The golgi tendon organ responds to changes in muscle tension, the spindles respond to changes in muscle length d. The golgi tendon organ responds to changes in muscle tension and the rate of muscle firing, the spindles respond to changes in muscle length and duration of firing

If we blocked all voltage-gated sodium channels in a lower motor neuron and then injected calcium into the axon terminus, the fibers in the associated motor unit would  Select one: a. Contract as long as calcium levels were high and the neuron didn't run out of acetylcholine. b. Contract for only a brief period of time and then relax. c. Remain relaxed.

The fast fatigable motor units are used predominantly for which of the following activities? a.Sleeping. b.Jumping. c.Walking. d.Sitting. e. Standing.

Muscle spindles trigger the muscle to   a. lengthen.   b. relax.   c. shorten.   d. remain fixed.

A decline in a skeletal muscle's ability to maintain a constant level of force or tension after prolonged repetitive stimulations is called A. complete tetanus B. recruitment C. fatique D. rigor mortis

Which of the following statements relating to the developmental aspects of muscles is false? a. All muscle tissue types arise from myoblasts b. Skeletal muscles become amitotic while smooth muscles regenerate throughout life c. Sarcopenia begins by age 30 and is irreversible d. Body strength per unit muscle mass is the same in both sexes  e. none of the above   Which of the following structures is located in the head region of the thick filament myosin? a. actin binding site b. ATP binding site c. ATPase enzyme d. all of the above e. none of the above

Muscle fatigue has been suggested as one factor that can increase the chances of non-contact sports injuries, such as anterior cruciate ligament (ACL) tears. Notably, some researchers have noted a delay in the reflex response after muscle fatigue. With your understanding of the stretch reflex, which of the following is the most logical contributing factor to the injury? a. the distraction of the game causes inhibitory impulses to be sent down from the somatosensory cortex, so muscles are not operating at full capacity b. the proprioceptors adapt and become less sensitive c. there is an increase in time to muscle contraction after triggering a reflex