BIOLOGICAL BASES OF BEHAVIOR
THE NERVOUS AND ENDOCRINE SYSTEMS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Blinking, coughing, and looking at your phone.
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Jerking your leg when the Dr. taps your knee, blinking and texting on your phone
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coughing, sneezing
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Blinking, jerking your let when the Dr. taps your knee, pulling away when something is hot
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Detailed explanation-1: -What’s a DTR? The reflex that the doctor checks by tapping your knee is called the patellar, or knee-jerk, reflex. It is also known as a deep tendon reflex (DTR) because the doctor is actually tapping on a tendon called the patellar (say: puh-TEL-ur) tendon.
Detailed explanation-2: -The knee-jerk reflex falls under the category of muscle stretch reflexes, where tapping a tendon leads to the activation of a muscle spindle, leading to nerve fiber activation in the spinal cord, which further leads to a response through a motor neuron2. The knee-jerk reflex is also known as the patellar reflex.
Detailed explanation-3: -There are different types of reflexes, including a stretch reflex, Golgi tendon reflex, crossed extensor reflex, and a withdrawal reflex.
Detailed explanation-4: -1+ = a slight but definitely present response; may or may not be normal. 2+ = a brisk response; normal. 3+ = a very brisk response; may or may not be normal. 4+ = a tap elicits a repeating reflex (clonus); always abnormal.