,BIOL 251 Module 8 Exam | Human Anatomy &
Physiology I w/Lab Exam Q&A | Portage Learning
1. The special senses include vision, hearing, equilibrium, taste, and smell.
Which of the following is NOT a special sense?
A) Touch
B) Hearing
C) Gustation
D) Olfaction
Correct Answer: A) Touch
Rationale: The five special senses are vision, hearing, equilibrium, taste, and
smell. Touch is classified as a general sense because its receptors are widely
distributed in the skin and internal organs, not localized in specialized sense
organs.
2. The sensory receptors responsible for taste and smell are classified as:
A) Mechanoreceptors
B) Chemoreceptors
C) Photoreceptors
D) Thermoreceptors
Correct Answer: B) Chemoreceptors
Rationale: Taste and smell receptors respond to dissolved chemical substances:
tastants in saliva for gustation and odorants in air for olfaction. They are
,chemoreceptors, not mechanoreceptors (touch), photoreceptors (light), or
thermoreceptors (temperature).
3. The transparent anterior part of the eye that bends light as it enters is the:
A) Iris
B) Lens
C) Cornea
D) Retina
Correct Answer: C) Cornea
Rationale: The cornea is the clear, curved surface covering the iris and pupil. It
refracts light significantly because of the density difference between air and the
cornea. The lens fine-tunes focus through accommodation.
4. Which structure controls the amount of light entering the eye by adjusting
pupil size?
A) Retina
B) Cornea
C) Lens
D) Iris
Correct Answer: D) Iris
, Rationale: The iris contains circular and radial smooth muscles that constrict or
dilate the pupil in response to light intensity, similar to a camera aperture. The
retina senses light, the cornea and lens focus it.
5. The opening in the center of the iris through which light passes is the:
A) Pupil
B) Fovea
C) Optic disc
D) Canal of Schlemm
Correct Answer: A) Pupil
Rationale: The pupil is the hole that allows light to reach the lens and retina. Its
size is regulated by the iris to optimize illumination and depth of focus. It
appears black because light is absorbed inside the eye.
6. The lens of the eye focuses images on the retina by changing shape through:
A) Accommodation
B) Refraction
C) Convergence
D) Constriction
Correct Answer: A) Accommodation
Physiology I w/Lab Exam Q&A | Portage Learning
1. The special senses include vision, hearing, equilibrium, taste, and smell.
Which of the following is NOT a special sense?
A) Touch
B) Hearing
C) Gustation
D) Olfaction
Correct Answer: A) Touch
Rationale: The five special senses are vision, hearing, equilibrium, taste, and
smell. Touch is classified as a general sense because its receptors are widely
distributed in the skin and internal organs, not localized in specialized sense
organs.
2. The sensory receptors responsible for taste and smell are classified as:
A) Mechanoreceptors
B) Chemoreceptors
C) Photoreceptors
D) Thermoreceptors
Correct Answer: B) Chemoreceptors
Rationale: Taste and smell receptors respond to dissolved chemical substances:
tastants in saliva for gustation and odorants in air for olfaction. They are
,chemoreceptors, not mechanoreceptors (touch), photoreceptors (light), or
thermoreceptors (temperature).
3. The transparent anterior part of the eye that bends light as it enters is the:
A) Iris
B) Lens
C) Cornea
D) Retina
Correct Answer: C) Cornea
Rationale: The cornea is the clear, curved surface covering the iris and pupil. It
refracts light significantly because of the density difference between air and the
cornea. The lens fine-tunes focus through accommodation.
4. Which structure controls the amount of light entering the eye by adjusting
pupil size?
A) Retina
B) Cornea
C) Lens
D) Iris
Correct Answer: D) Iris
, Rationale: The iris contains circular and radial smooth muscles that constrict or
dilate the pupil in response to light intensity, similar to a camera aperture. The
retina senses light, the cornea and lens focus it.
5. The opening in the center of the iris through which light passes is the:
A) Pupil
B) Fovea
C) Optic disc
D) Canal of Schlemm
Correct Answer: A) Pupil
Rationale: The pupil is the hole that allows light to reach the lens and retina. Its
size is regulated by the iris to optimize illumination and depth of focus. It
appears black because light is absorbed inside the eye.
6. The lens of the eye focuses images on the retina by changing shape through:
A) Accommodation
B) Refraction
C) Convergence
D) Constriction
Correct Answer: A) Accommodation
