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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Define enzymes
What will be an ideal response?
Anatomy & Physiology
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
Damage to a bone because of extreme load, sudden impact, or stresses applied from an unusual direction is called a
A) sprain. B) fracture. C) hematoma. D) callus. E) displacement.
Anatomy & Physiology
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
Anatomy & Physiology