Problem 8 - Biology of Humans: Concepts, Applications, and Issues

Question

Choose the incorrect statement about the production of sound called the voice: a. Speaking sounds are produced when the epiglottis vibrates. b. Thicker vocal cords produce deeper voice sounds. c. Laryngitis results when the vocal cords become swollen and thick and cannot vibrate easily d. There are only two true vocal cords.

Step-by-Step Solution

Answer

a. Speaking sounds are produced when the epiglottis vibrates.

Step 1: Understanding the Epiglottis Function

The epiglottis is a flap of cartilage located behind the tongue and in front of the larynx. It serves to prevent food and drink from entering the windpipe during swallowing. It does not play a role in producing vocal sound vibrations. Thus, statement a is likely incorrect.

Step 2: Examining Vocal Cord Thickness

Thicker vocal cords indeed produce deeper voice sounds due to lower frequency vibrations. This makes statement b correct.

Step 3: Checking Laryngitis' Effect on Vocal Cords

Laryngitis causes swelling and thickening of the vocal cords, making them difficult to vibrate and produce sound. Thus, statement c is also correct.

Step 4: Vocal Cord Count Analysis

Humans have two true vocal cords, which are responsible for sound production. Hence, statement d is correct.

Step 5: Conclusion

Since statements b, c, and d are correct, statement a is the incorrect one.

Key Concepts

epiglottis function

The epiglottis is an essential part of our body's anatomy. It is a small, leaf-shaped flap made of cartilage located just behind the tongue and above the larynx. Its primary function is to act as a switch between the larynx and the esophagus, ensuring that food and liquid go into the esophagus and not into the windpipe when you swallow. This crucial role helps prevent choking.
An important thing to note here is that the epiglottis does not have any role in producing sound. It does not vibrate to create your voice. Its job is more about protection than sound production. So, thinking the epiglottis vibrates to produce voice is a misconception.

vocal cord thickness

The thickness of your vocal cords greatly influences the pitch and depth of your voice. Vocal cords are bands of muscle located in the larynx.
Thicker vocal cords vibrate at a lower frequency, which produces a deeper sound. This is why people with thicker or longer vocal cords typically have deeper voices. On the other hand, thinner vocal cords vibrate at a higher frequency, resulting in a higher-pitched voice.
Thus, the thickness, length, and tension of the vocal cords together determine the pitch and quality of the voice, making understanding their characteristics important for comprehending voice production.

laryngitis effects

Laryngitis is a condition where the vocal cords become inflamed and swollen. This inflammation can be caused by a variety of factors, such as infections, overuse, irritants, or allergies. When the vocal cords are swollen, they cannot vibrate as they normally would.
This leads to a hoarse voice or loss of voice completely. It's akin to trying to play a musical instrument that has damaged strings—the sound won't be right or might not come out at all. Thus, laryngitis directly hampers the ability of the vocal cords to produce sound, making it an essential point to understand for anyone studying voice production.

vocal cord count

Humans have two true vocal cords, also known as vocal folds. These are located in the larynx and are essential for sound production. The vocal cords work by coming together and vibrating as air passes through them from the lungs.
This vibration produces sound waves, which are then modified by the throat, mouth, and nose to produce specific sounds and words. It's important to distinguish between 'true' vocal cords and 'false' vocal cords, which do not play a direct role in sound production. Understanding the basic count and role of the true vocal cords is fundamental for anyone learning about how human voice is produced.