Describe how the eye focuses on objects moving nearer or farther away. Include the following in your answer : lens, ciliary muscle, suspensory ligaments, fovea, more light refraction, and less light refraction
What will be an ideal response?
Viewing objects far away requires less light refraction in order to focus the image on the fovea; therefore, the ciliary muscle relaxes, allowing the suspensory ligaments to become taut. This stretches the lens, causing it to flatten and refract (bend) light less. When the object is closer, the light must be refracted to a greater degree. In response, the ciliary muscle contracts and loosens the suspensory ligaments. This allows the lens to become more rounded and refract to a greater degree.
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Minerals are organic molecules.
Answer the following statement true (T) or false (F)
The first heart sound (the "lub" of the "lub-dup") is caused by __________.
opening of the atrioventricular valves closure of the atrioventricular valves opening of the semilunar valves closure of the semilunar valves
Parasympathetic innervation of the heart occurs via
A. CN XII. B. CN IV. C. CN VIII. D. CN X. E. CN VI.
Sixty-five year old Stephen has knee replacement surgery which requires a thin section of his distal femur to be removed. Which of the following statements is true?
A. The health care team informs Stephen he is at high risk for osteomyelitis due to his age. B. As long as the surgery has minimal bleeding, Stephen will have no risk for developing osteomyelitis. C. Stephen has no risk of osteomyelitis because he tests negative for Staphylococcus aureus when given a skin swab. D. Due to the invasive nature of the surgical procedure, Stephen is at risk for osteomyelitis, a bacterial infection of bone.