Reflex Arcs and Reaction Rate Objective: To investigate different reflex arcs and reaction rate. Materials: rubber reflex hammer penlight or microscope light 30 cm ruler table or chairs Procedure: KNEE JERK 1. have subject sit on a chair with their legs crossed and relaxed 2. using a reflex hammer, locate and gently strike the tendon below the knee cap. 3. a) describe the movement of the leg 4.
ask the subject to clench a book with both hands and strike the tendon again. b) compare the movement to 3 a ACHILLES REFLEX 5. have the subject remove their shoe and kneel on a chair with their feet hanging off the edge of the chair. Push the toes towards the leg of the chair and lightly tap the Achilles tendon with the reflex hammer.
c) describe the movement of the foot BABINSKI REFLEX 6. have the subject remove a shoe and sock, sit on a chair and place the barefoot on an adjacent chair for support. Quickly slide the reflex hammer across the sole of the foot from heel to toe. d) describe the movement of the toes PUPILLARY REFLEX 7. have the subject close one eye for about one minute. When the open the closed eye, compare the size of the pupils.
e) which pupil is larger? 8. Ask the subject to close both eyes for one minute. Once the eyes are opened, shine a penlight in one of the eyes. f) Describe the changes you observe in the pupil. REACTION RATE 9. Ask your subject to place his or her forearm flat on the surface of a desk with their entire hand extended over the edge.
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10. Ask the subject to place the index finger and thumb approximately 2 cm apart. Place a 30 cm ruler between the thumb and forefinger of the subject. 11. Indicate when ready, and release the ruler. Measure the distance the ruler falls before being caught.
Repeat the procedure for the left hand and record the data in a table. Observations: KNEE JERK -When the subject’s tendon below the knee is hit with the reflex hammer, the leg flinches upwards and the foot points up as well. – When the subject is asked to clench a book, the knee kicked higher then when the subject was without the book. ACHILLES REFLEX – When the Achilles tendon is tapped with the reflex hammer the foot / toes twitch upward. BABINSKI REFLEX – When the soles of the foot are touched by the reflex hammer, the subjects foot / toes moves towards the body. The toes also wiggle.
PUPILLARY REFLEX – When the subject is asked to close one eye for one minute and then to open it, the eye that was closed had a larger pupil which in a short time returned to the same size as the eye that was open during that minute. – When both eyes are closed for one minute and a penlight is shone in one eye upon opening, the pupil with the light shone into it became smaller faster then the other pupil.