Identify if the following statement is true or false: Reflexes are rapid, automatic responses to stimuli that will produce the same effect every time. True False Question 26 (2.5 points) A nurse pricks your finger to type your blood. You flinch at the pain, pulling your hand back. This is called the __ reflex. flexor (withdrawal) crossed extension stretch painful tendon
The Correct Answer and Explanation is:
- Statement: Reflexes are rapid, automatic responses to stimuli that will produce the same effect every time.
Answer: True
Reflexes are indeed rapid, automatic responses that occur without conscious thought. They are designed to protect the body from harm, often producing the same reaction every time they are triggered by specific stimuli. For example, when you touch something hot, the reflex action causes you to quickly pull your hand away. Reflexes are controlled by the spinal cord and do not require input from the brain, making them both fast and consistent. - The reflex described in the scenario (a nurse pricking your finger) is called the ____ reflex.
Answer: Flexor (withdrawal) reflex
When you experience pain, such as from the needle prick, the body activates a reflex to pull away from the source of discomfort. This is known as the flexor or withdrawal reflex. The flexor reflex involves the contraction of muscles that cause a limb to withdraw from the painful stimulus, helping to protect the body from further harm. This reflex is usually initiated in response to a noxious (painful) stimulus, and it occurs without conscious thought, making it rapid and automatic. The reflex pathway typically involves sensory neurons detecting the painful stimulus, which then send a signal to the spinal cord. In the spinal cord, interneurons process the information and relay a signal to motor neurons, which cause the muscles to contract and withdraw the affected body part. For example, when the nurse pricks your finger, sensory neurons in your skin send signals to the spinal cord, which then causes the muscles in your arm to contract and pull your hand away from the painful stimulus.
This reflex is critical for survival because it helps the body avoid injury or further harm. It is one of the simplest types of reflexes in the body but is incredibly effective.
