When you are exposed to bright light, a reflex is initiated and your iris constricts to decrease pupil size. Which structure serves as a receptor in this system?

A. The retina ?B. The iris ?C. The eyelid ?D. The brain's visual cortex


A

Anatomy & Physiology

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Damage to a bone because of extreme load, sudden impact, or stresses applied from an unusual direction is called a

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Define enzymes

What will be an ideal response?

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This figure shows the muscles of facial expression. What muscle does number 3 indicate?

A. Platysma B. Epicranius C. Orbicularis oris D. Orbicularis oculi E. Nasalis

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The product of the stroke volume times the heart rate is known as the

A. cardiac reserve. B. venous return. C. end-diastolic volume. D. cardiac output. E. end-systolic volume.

Anatomy & Physiology