Which is a cause of progressive slowing of responses and reflexes in older adults?
Decreased impulse conduction speed
Atherosclerosis and decreased cellular respiration
Inadequate tissue oxygenation
Loss of neurons in the brain
The Correct Answer is A
A. Decreased impulse conduction speed
Aging causes slower nerve conduction due to loss of myelin and reduced neurotransmitter activity, leading to slower reflexes and response times.
B. Atherosclerosis and decreased cellular respiration
These factors affect circulation and energy production but are not primary causes of slowed neurologic responses.
C. Inadequate tissue oxygenation
Can affect brain function acutely, but it's not the main cause of chronic, gradual slowing in the elderly.
D. Loss of neurons in the brain
While this occurs with aging, slowed reflexes are more specifically linked to nerve impulse transmission rather than neuron quantity alone.
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Related Questions
Correct Answer is ["A","B","C"]
Explanation
A. Decreased resting cardiac output
Cardiac output decreases due to reduced myocardial efficiency and heart muscle compliance.
B. Increased risk for heart attack
Atherosclerosis and vascular stiffness raise the risk of myocardial infarction.
C. Increased blood pressure
Arterial stiffness and decreased elasticity lead to increased systolic blood pressure.
D. Increased coronary blood flow
Blood flow may actually decrease due to narrowing of coronary arteries.
E. Decreased rigidity of the heart
Aging causes the heart muscle to increase in rigidity (i.e., become stiffer), not decrease.
Correct Answer is C
Explanation
A. Arteries dilate, lengthen, and become more rigid
Arteries do not typically dilate; they narrow and stiffen with age.
B. Chronic hypoxic state of the brain
May affect mental function, not a direct cause of high BP.
C. Arteries constrict, lengthen and become more rigid
Arterial stiffness and loss of elasticity increase systemic vascular resistance, contributing to hypertension.
D. Decreased heart rate and stroke volume
May occur, but these typically cause lower, not higher, blood pressure.
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