Podcast
Questions and Answers
Which of the following correctly pairs a sensory organ with its primary stimulus?
Which of the following correctly pairs a sensory organ with its primary stimulus?
- Skin: Chemicals in the air
- Ears: Light
- Nose: Chemicals in the air (correct)
- Tongue: Sound waves
If the ciliary muscle in the eye were to become paralyzed, which function would be MOST directly affected?
If the ciliary muscle in the eye were to become paralyzed, which function would be MOST directly affected?
- Controlling amount of light entering the eye.
- Focusing light on objects at varying distances. (correct)
- Maintaining the overall shape of the eyeball.
- Detecting different colors of light.
What is the primary function of the choroid layer in the human eye?
What is the primary function of the choroid layer in the human eye?
- To control the size of the pupil.
- To prevent internal reflection of light. (correct)
- To refract light as it enters the eye.
- To transmit nerve impulses to the brain.
Why is the yellow spot in the retina the area of greatest visual acuity?
Why is the yellow spot in the retina the area of greatest visual acuity?
A person is having difficulty seeing in low light conditions but has normal color vision. Which type of photoreceptor is MOST likely malfunctioning?
A person is having difficulty seeing in low light conditions but has normal color vision. Which type of photoreceptor is MOST likely malfunctioning?
Which of the following structures is responsible for both maintaining the shape of the eyeball and focusing light?
Which of the following structures is responsible for both maintaining the shape of the eyeball and focusing light?
A scientist is investigating how the eye adjusts to different light intensities. Which pair of structures would be MOST relevant to this study?
A scientist is investigating how the eye adjusts to different light intensities. Which pair of structures would be MOST relevant to this study?
What is the MAIN purpose of the conjunctiva?
What is the MAIN purpose of the conjunctiva?
Flashcards
Sensory Organs
Sensory Organs
Organs (skin, nose, tongue, eyes, ears) that detect stimuli.
What do sensory organs detect?
What do sensory organs detect?
Eyes detect it, ears detect sound, nose detects chemicals in the air, tongue detects chemicals in food, and skin detects touch.
Conjunctiva
Conjunctiva
Protects the front of the sclera.
Aqueous Humor
Aqueous Humor
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Pupil
Pupil
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Iris
Iris
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Cornea
Cornea
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Rod cells
Rod cells
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Study Notes
Sensory Organs and Stimuli
- Humans possess five senses: touch, smell, taste, hearing, and sight.
- Sensory organs detect each of these distinct senses.
- The specific organs are skin, nose, tongue, eyes, and ears.
- Each sensory organ responds to particular stimuli.
Sensory Organs and Their Stimuli
- Eyes are sensitive to light.
- Ears are sensitive to sound and balance.
- Noses are sensitive to airborne chemicals.
- Tongues are sensitive to chemicals in food.
- Skin is sensitive to touch.
The Eye
- The front of the eye includes the sclera, iris, and pupil.
Parts of the Human Eye and Their Functions
- Conjunctiva: A transparent membrane that protects the front part of the sclera.
- Aqueous humor: A transparent fluid that maintains the shape of the eyeball and focuses light.
- Pupil: The opening in the center of the iris, controlling the amount of light entering the eye.
- Iris: The colored part of the eye, controlling the size of the pupil.
- Cornea: A transparent layer that refracts and focuses light onto the retina.
- Suspensory ligaments: Strong fibers that hold the eye lens in position.
- Ciliary muscle: Changes the thickness of the eye lens through contractions and relaxations.
- Eye lens: A transparent and elastic convex lens that focuses light onto the retina.
- Sclera: A strong layer that maintains the shape of the eye and protects it.
- Choroid: A black layer that prevents reflection of light and supplies oxygen and nutrients.
- Retina: A layer containing photoreceptors that detect light and produce nerve impulses.
- Yellow spot: The part of the retina most sensitive to light due to many photoreceptors.
- Optic nerve: Nerve fibers that carry nerve impulses from the retina to the brain.
- Blind spot: The part of the retina not sensitive to light, also an exit point for optic nerve fibers.
- Vitreous humor: A transparent, jelly-like substance that maintains the shape of the eyeball and focuses light.
Color Perception
- The retina has two types of photoreceptors: rod cells and cone cells.
- Rod cells are sensitive to different light intensities, including faint light, but not colors.
- Cone cells are sensitive to colors of light under bright conditions.
- There are three types of cone cells, each sensitive to red, green, and blue light.
Additional Information
- Eyelids spread tears to maintain moisture and cleanliness.
- Tears have antibacterial properties from contained chemicals.
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Description
Explore the five human senses: touch, smell, taste, hearing, and sight. Learn about the sensory organs responsible for each sense, including the eyes, ears, nose, tongue, and skin, and the specific stimuli they detect, such as light, sound, and chemicals.
