BackAnatomy & Physiology Exam 1: Chapters 17-19 Key Concepts
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1/14BackSkip to main contentBackWhere are light rays focused in an individual with myopia?
Light rays are focused in front of the retina in myopia. What are the two main components of the fibrous layer of the eyeball?
The fibrous layer consists of the sclera and cornea. Which part of the vascular layer absorbs excess light to prevent reflection?
The choroid absorbs excess light to prevent reflection and scattering. Which cranial nerve provides sensory input for the anterior 2/3 of the tongue?
The facial nerve (CN VII) provides sensory input for the anterior 2/3 of the tongue. Which area of the retina provides the sharpest vision?
The fovea provides the sharpest vision. Which layer of the eyeball is responsible for protection and muscle attachment?
The sclera provides protection and muscle attachment. What is the most common second messenger in signal transduction pathways?
cAMP is the most common second messenger. Which cell type produces insulin?
Beta (β) cells produce insulin. Which autonomic nervous system division releases acetylcholine at both pre- and postganglionic fibers?
The parasympathetic division releases acetylcholine at both pre- and postganglionic fibers. What is true about hormone receptors located in the plasma membrane?
They initiate cellular responses through signal transduction pathways. What does hematocrit measure?
Hematocrit measures the percentage of red blood cells in total blood volume. Which factor does NOT cause a reduction in hematocrit?
Dehydration does not reduce hematocrit; it can increase it. Why does hemoglobin change color?
Hemoglobin changes color due to the change in the electronic state of iron in the heme group when binding or releasing oxygen. What is the primary function of red blood cells?
The primary function is gas transport, mainly oxygen and carbon dioxide.
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