Download E2 – Perception of Stimuli

IB Biology
E2 – Perception of Stimuli
Syllabus Statements
E. 2. 1 Outline the diversity of stimuli that can be detected by human sensory receptors,
including mechanoreceptors, chemoreceptors, thermoreceptors and photoreceptors.
E.2.2 Label a diagram of the structure of the human eye.
E.2.3 Annotate a diagram of the retina to show the cell types and the direction in which light
moves.
E.2.4 Compare rod and cone cells.
E.2.5 Explain the processing of visual stimuli, including edge enhancement and contralateral
processing.
E.2.6 Label a diagram of the ear.
E.2.7 Explain how sound is perceived by the ear, including the roles of the eardrum, bones of
the middle ear, oval and round windows, and the hair cells of the cochlea.
Text Reference:
45.1 – Receptors (pg. 898-899)
45.3 – The Ear & Hearing (pg. 904-907)
45.5 – The Eye & Vision (pg. 911-914)
You may also use the Understanding Biology and Heath Biology books in the cupboard
Raven: Chapter 45
Questions:
1. Outline what types of stimuli are detected by each of the following and give an example
of an organ/structure that detects this stimulus:
a) mechanoreceptors
b) chemoreceptors
c) thermoreceptors
d) photreceptors
2. a) Label the following structures on the diagram of the human eye: sclera, cornea,
conjunctiva, choroid, aqueous humor, pupil, lens, iris, vitreous humor, retina, fovea, optic
nerve, blind spot
b) Identify the function of each part
3. Label the diagram of the structure of the retina. (Include the following structures: rod
cells, cone cells, ganglion cells, bipolar neurons). Show the direction that light moves.
4. Describe the properties of rod and cone cells. (Include the type of light detected,
wavelengths detected, passage of impulse)
5. a) Label the following structures on the diagram of the human ear: pinna, eardrum
(tympanic membrane), bones of the middle ear, oval window, round window,
semicircular canals, auditory nerve, cochlea
b) Identify the function of each part.
6. Explain how the structures above play a role in how the brain perceives sound.