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Day: May 27, 2024
How Humans Hear
The first step of how humans hear is when sound waves enter the ear.
When sound occurs it enters our body through the outer ear also known as the pinna or auricle. When the sound waves hit the pinna it filters and amplifies the the sound. The sound waves then hit the eardrum making it vibrate. “The ear is a paper-thin membrane that vibrates violently when sound waves hit it. It’s really like a drum.”Dr. Mehdizadeh says.
Next the sound travels throught the middle of the ear.
Behind the eardrum lives the middle ear. In this part of the ear’s anatomy, sound waves are amplified before they are delivered to the inner ear.The eardrum is attached to a chain of three small bones called ossicles. These three muscles are the smallest in your body. When the eardrum vibrates in response to sound waves, these muscles are also set in motion.
Heart Dissection
Aim: The aim of this experiment was to identify all the parts of a heart. Hypophosis: My hypophosis is that the heart will be squishy and it will be layed out just like the photos. Method: First we found the soft side of the heart Then we cut it straight down the soft side of the heart Opening it up we layed it flat in the dissecting tray to examine Results:
Explanation: At the top of the heart is the aorta. In the middle is all the heart strings that connect everything together. Conclution: Everything did work the way that I expected it to. The only thing that I wasn't expecting was the way it smelt and how squishy and meat like it was.