Worksheet IX:
Senses-General, Taste, & Smell
1. Receptors are classified in 3 ways. Name them.
_____________________________
_____________________________
_____________________________
2. There are 2 subdivisions of receptors classified by
location; they are:
_____________________________
_____________________________
3. List the 5 receptors based on the kind of stimuli they
detect.
_____________________________
_____________________________
_____________________________
_____________________________
_____________________________
4. Identify the receptors described below as: exteroceptors or
interoceptors and any one of the 5 receptors based on the kind of
stimuli they detect.
a. Sensitive to changes in
temperature.
_____________________________
b. Sensitive to light and color.
_____________________________
c. Respond to painful stimuli.
_____________________________
d. Located in joints, tendons, and
muscle.
_____________________________
e. Sensitive to sound.
_____________________________
f. Detect oxygen, CO2, and pH in
blood.
_____________________________
5. Identify the kind of receptor classified by structure based on the
descriptions given below.
a. Lg (2 mm) and resembles cut onion; detects
deep
pressure and pulsing vibrations or high frequency
stimuli.___________________________
b. A flattened capsule found in dermis;
sensitive to
pressure and distortion of the skin.
_____________________________
c. Dendrites with swellings that detect
pain. _____________________________
d. Egg-shaped mechanoreceptors; detect low
frequency vibrations; light pressure or fine touch.
surrounded by modified Schwann cells.
_____________________________
e. 3-10 modified skeletal muscle
fibers-intrafusal fibers.____________________________
f. Sensitive to stretching of
muscle.
_____________________________
g. For fine touch and pressure; extremely
sensitive;
found in stratum germinativum.
_____________________________
h. Tendon fibers wrapped in
capsule.
_____________________________
i. Monitor muscle tension.
_____________________________
6. Taste buds are classified as: _______________________
(thermo/chemo/mechano/etc.)
7. __a__ are the sensory organs for taste. There are
approximately 10,000 on the tongue's surface in raised projections
called __b__. Each __b__ is composed of 40-60 epithelial cells
divided into 3 groups: __c__ cells, that surround the other
cells, __d__ cells that are the receptors, and __e__ cells that give
rise to new __d__ cells. The __d__ cells are bathed in saliva
with a __f__ hair that protrudes through an opening called the __g__
. Chemicals that dissolve in saliva contact __f__ hairs and bind
to receptors on these hairs. The receptors give rise to EPSPs called
__h__. A nerve impulse travels to the brain via the __i__ (VII),
__j__ (IX), and __k__ (X) nerves synapsing in the __l__ and then on to
the __m__ region of the __n__ lobes.
a. _____________________________
h. ___________________________
b. _____________________________
i. ___________________________
c. _____________________________
j. ___________________________
d. _____________________________
k. ___________________________
e. _____________________________
l. ____________________________
f. ______________________________
m. ___________________________
g. _____________________________
n. ___________________________
8. Name the 4 kinds of taste receptors.
_____________________________
_____________________________
_____________________________
_____________________________
9. Identify the kind of taste receptor based on the descriptions given
below.
a. Detects acids; located on sides of
tongue.
_____________________________
b. Detects NaCl.
_____________________________
c. Detects sugars, saccharin, and some amino
acids. _____________________________
d. Detects alkaloids-quinine, nicotine, caffeine,
strychinine. ___________________________
e. Located at back of tongue.
_____________________________
10. Olfactory receptors are ________________________
(extero/interoceptors).
11. The olfactory epithelium is the organ of smell located in the roof
of the __________________ cavity.
12. There are approximately 5 million __a__ cells in the upper conchae.
These cells are surrounded by __b__ cells. The __a__ cells are
__c__ neurons that have their dendrites anchored to __d__ hairs.
Unmyelinated axons lead from these __a__ cells forming the __e__
nerve. This nerve penetrates the __f__ of the __g__ bone and
synapse in the __h__ bulbs. With a new stimulus the __i__ cells send
axons to the __j__ cortex. Other fibers lead to the __k__, limbic
system, and __l__ bodies. Normally, other cells, called __m__
cells, in the __h__ bulb inhibit __i__ cells.
a. _____________________________
h. ___________________________
b. _____________________________
i. ___________________________
c. _____________________________
j. ___________________________
d. _____________________________
k. ___________________________
e. _____________________________
l. ____________________________
f. ______________________________
m. ___________________________
g. _____________________________