Which of the following describes a stretch reflex?A. The receptor detects that a muscle is stretched, and sends a signal to contract it reflexively.B. The receptor detects that a muscle is contracted, and sends a signal to stretch it reflexively.

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

Electric signals can be used to Write the letters of all that apply in the box below. Use all capital letters, with no punctuation. For example, if A and B are correct, write "AB". If only A is correct, write "A". A) strengthen the muscle. B) activate the muscle after injury. C) block pain. D) contract muscles.

What signal does the lIA afferent send? It signals the alpha motor neuron to contract the extrafusal muscle fibers O It signals the gamma motor neuron to cause contraction of the intrafusal muscle fibers O It signals to the muscle spindle to stop firing It signals to the alpha motor neurons to stop firing so the muscle can relax

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

How does the brain initiate a muscle contraction? Please order the steps that occur at the neuromuscular junction. Arrange responses in the correct order to answer the question.