What is the biological purpose of the photo pupil reflex?
Regulate the amount of light that enters the eye
What is the biological purpose of the convergence reflex?
What is the biological purpose of the patellar reflex?
What is the “Babinski” sign or reflex?
Under 18 months – the big toe extends out with or without the fanning of the other toes when the sole is stimulated
Stimulation of the sole of the foot of a child under 18 months will produce which reflex?
Explain your answer to question 5 (Babinski)
Lack of development of the Myelin Sheath due to lack of myelination of the Cortical Spinal Tract
Stimulating the foot of an adult patient produces a “Babinski” sign. What is the possible explanation of this result?
Disease like Multiple Sclerosis; lack of development, damage to the Cortical Spinal Tract
Threshold voltages of motor points can vary from person-to-person. What could account for these differences in threshold voltages?
Scar tissue, density of the tissue
When a nerve cell is at rest there is relatively > concentration of which type of ion on the outside of the membrane?
When Na+ are actively transported outward through a nerve cell membrane they are exchanged for…..
The resting potential becomes less negative (-70 mV toward 0) in response to stimulation, the process is called…..
Following Depolarization, K+ diffuse outward and cause the membrane to become…..
An irregular surface of the lens or cornea is referred to as……
20/70 visual acuity is…..
Worse than normal vision
Why does the near point accommodation often increase with age?
Loss of elasticity
Describe what is meant by 20/15 visual acuity……
Better than normal vision; a person who stands at 20ft can read what a person with normal vision can read at 15ft
Why is it important to refrigerate a urine sample if analysis cannot be performed immediately?
Slows microbial growth
Describe the test for visual acuity in lab 15
1) Stand 20 feet from the Snellen chart and cover the right eye 2)read down the chart until he/she can no longer focus the letters 3)record the nuber of the last line that can be successfully read, at 20ft
The normal range for specific gravity of urine is……
List 5 types of sediments most often found in a centrifuged urine sample.