Answer: the antigens identify the foreign invader
The structure that collects sound and funnels it into the auditory canal is called the pinna.
The ear is an exposed and sensitive organ in the human body. It is concerned with collecting, transmitting, and producing sounds. It also helps to maintain balance in the body. It has three main parts: the external ear, the middle ear, and the internal ear. Pinna is a part of the external ear.
Pinna is also called auricle. It is composed of cartilage folds that are covered by skin. The only part of the audible which is not covered by cartilage is the lobule. The curvature formed by cartilage is known as a helix. Another part of the pinna includes the meatus which is responsible for directing sounds collected by the helix.
Pinna acts as a link that transfers sound signals from the air to the auditory canal inside the ear. The tympanic membrane carries the sounds in an S-shaped path towards the middle ear (auditory canal).
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There is many reasons why people have depression. Loss of a family member, bullying, physically abused or mentally abused. Persistent Depressive Disorder is Depression that lasts about 2 years or more it could cause change in appetite, sleep to much or too little, also a lack of energy or fatigue. You could also have low self-esteem even have trouble concentrating and making decisions. You could also feel hopeless you would need therapy and sometimes medications. There is about 9 different depression or more I hope this helps.
The brain region that plays a key role in integrating information and sending appropriate signals to autonomic centers is the amygdala. The amygdala receives sensory information from multiple pathways.
The amygdala, also known as the 'fear center' is located in the medial temporal lobe.
The amygdala receives sensory information from subcortical and cortical processing pathways, which is associated with the threat, and then orchestrates reactions by controlling the autonomic center.
The amygdala is involved in the perception of different emotions (e.g., anger, fear, sadness, etc).
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