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The external ear structure is called the Pinna.
The Pinna helps to channel sound waves into the ear.
Many animals have the ability to move their pinna towards the direction of sound.
I have attached an image of a dog's ear to show you the external structure called the Pinna.
I hope this helps! I'm happy to answer any other questions you might have :)
[Image sourced from: https://www.msdvetmanual.com/dog-owners/ear-disorders-of-dogs/ear-structure-and-function-in-dogs]
DNA. Deoxyribonucleic acid (DNA<span>) is a nucleic acid that contains the genetic instructions for the development and function of </span>living things<span>. All known cellular life and some viruses contain </span>DNA<span>. The main role of </span>DNA<span> in the cell is the long-term storage of information.</span>
C cells of the thyroid gland secrete calcitonin.
<h3>
What does C cells of thyroid gland produce?</h3>
- The thyroid follicle, which is the gland's active component, is encircled by a single layer of epithelial cells, and the lumen is stuffed with colloidal material.
- It includes parafollicular cells, or C cells, which release calcitonin.
- The C-cells of the thyroid gland secrete calcitonin, a 32 amino acid hormone.
- When the concentration of blood calcium has grown over the usual range, the thyroid gland releases the hormone calcitonin, which lowers the level.
- The parafollicular cells, sometimes referred to as the C cells, of the thyroid gland are the principal producers of this polypeptide hormone, which has 32 amino acids.
Learn more about thyroid gland here:
brainly.com/question/27523862
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Disclaimer: The question was given incomplete on the portal. Here is the complete question.
Question: The C cells of the thyroid gland secrete
a) TSH.
b) parathormone.
c) thyroxine.
d) triiodothyronine.
e) calcitonin