Textbook Question
Describe the response of rhodopsin to light stimuli. What is the outcome of this cascade of events?
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Ch. 15 The Special Senses
Marieb, Hoehn11th EditionHuman Anatomy & PhysiologyISBN: 9780136874034
Not the one you use?Change textbookSelect a different textbook
Table of contents
- Ch. 1 The Human Body: An Orientation24
- Ch. 2 Chemistry Comes Alive25
- Ch. 3 Cells: The Living Units21
- Ch. 4 Tissue: The Living Fabric20
- Ch. 5 The Integumentary System11
- Ch. 6 Bones and Skeletal Tissues19
- Ch. 7 The Skeleton14
- Ch. 8 Joints7
- Ch. 9 Muscles and Muscle Tissue26
- Ch. 10 The Muscular System26
- Ch. 11 Fundamentals of the Nervous System and Nervous Tissue19
- Ch. 12 The Central Nervous System26
- Ch. 13 The Peripheral Nervous System and Reflex Activity32
- Ch. 14 The Autonomic Nervous System19
- Ch. 15 The Special Senses26
- Ch. 16 The Endocrine System23
- Ch. 17 Blood25
- Ch. 18 The Cardiovascular System: The Heart24
- Ch. 19 The Cardiovascular System: Blood Vessels27
- Ch. 20 The Lymphatic System and Lymphoid Organs and Tissues14
- Ch. 21 The Immune System: Innate and Adaptive Body Defenses27
- Ch. 22 The Respiratory System21
- Ch. 23 The Digestive System31
- Ch. 24 Nutrition, Metabolism, and Energy Balance26
- Ch. 25 The Urinary System26
- Ch. 26 Fluid, Electrolyte, and Acid-Base Balance24
- Ch. 27 The Reproductive System24
- Ch. 28 Pregnancy and Human Development25
- Ch. 29 Heredity11
Marieb, Hoehn11th EditionHuman Anatomy & PhysiologyISBN: 9780136874034Not the one you use?Change textbook
Chapter 15, Problem 22
Why do you often have to blow your nose after crying
Verified step by step guidance1
Understand that crying produces tears, which are primarily produced by the lacrimal glands located above each eye.
Recognize that tears serve to lubricate and protect the eyes, and excess tears drain through small openings called lacrimal puncta into the lacrimal sac and then into the nasal cavity via the nasolacrimal duct.
Know that when you cry a lot, the increased volume of tears overwhelms the drainage system, causing tears to spill over the eyelids and also increase fluid in the nasal cavity.
Realize that the excess fluid in the nasal cavity stimulates the mucous membranes, leading to a runny nose and the sensation of nasal congestion.
Therefore, blowing your nose after crying helps clear the excess fluid and mucus from the nasal passages, relieving the congestion caused by the overflow of tears.
Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Tear Production and Drainage
Tears are produced by the lacrimal glands to lubricate and protect the eyes. When crying, tear production increases significantly, and excess tears drain through small openings called puncta into the nasal cavity via the nasolacrimal duct.
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Connection Between Eyes and Nasal Cavity
The nasolacrimal duct links the eyes to the nose, allowing tears to flow from the eyes into the nasal passages. This anatomical connection explains why excess tears can cause a runny nose during crying.
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Nasal Congestion and Mucus Production
When tears enter the nasal cavity, they mix with mucus, increasing fluid volume and causing nasal congestion. This buildup often leads to the need to blow the nose to clear the excess fluid and mucus.
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Related Practice
Textbook Question
Which of the following is not a possible cause of conduction deafness?
a. Impacted cerumen
b. Middle ear infection
c. Cochlear nerve degeneration
d. Otosclerosis
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Textbook Question
Where are the olfactory sensory neurons, and why is that site poorly suited for their job?
Textbook Question
Pitch is to frequency of sound as loudness is to
a. Quality
b. Intensity
c. Overtones
d. All of these
Textbook Question
Which of the following is important in maintaining the balance of the body?
a. Visual cues
b. Semicircular canals
c. The saccule
d. Proprioceptors
e. All of these