Sense of Hearing and Sight Introduction to the Cardiovascular System

As we had tackled the lesson sense of hearing and sight last week, this is a deeper topic about them. Let's first discuss about the sense of hearing. In the concepts of hearing, the ear is divided into three sections : the outer, middle, and inner ear. These divisions contain some of the most important parts and their functions in order to safely transmit and receive sound waves at the right frequency. Otherwise, we would've gone deaf so easily. In the outer ear, contains the pinna (auricle), auditory canal (external auditory meatus), and the eardrum (tympanic membrane). They are the ones responsible for first receiving the sound waves coming from outside and serve as the first line of protection against unstable frequencies. The middle ear we have the hammer (malleus), the anvil (incus), and the stirrup (stapes). They are known in also helping transmit sound waves and conduct them to send messages to the brain. Finally, we have the inner ear having vestibular nerves, semicircular canals, and the cochlea. They are mainly responsible for converting sound waves in order to send messages to the nervous system then to the brain.

The sense of sight is a lot different from sense of hearing. This does not focus more on sound waves but rather the reflection and the refraction of light. It can be either concave or convex as we learn in advanced physics. Our eyes, like the ears, are very delicate, can be easily damaged, and divided into two liquid fillings : aqueous and vitreous humor. They are the ones that make our eyes very watery which is important for removing dirt and other foreign agents away from our bodies. However, there are some pathogens that can resists those liquid fillings and make worsening conditions. One of these abnormal conditions is commonly what we call "sore eyes" or in medical terms conjunctivitis. Conjunctivitis frequently occurs whenever a pathogen or an irritant caused either by allergy or the pathogen itself.

Now we have the introduction to the cardiovascular system also known as the circulatory system. The main organ that consists of the circulatory system is the heart which is the most important part of our body. It helps the other parts of the body like the lungs to breathe in oxygen and release carbon dioxide through exhaling. The heart does this by its subparts which are the artery, veins, and the capillaries. Arteries are known to have the color red, veins for the color of blue, and capillaries for brown-like color. They aren't exactly like the RBCs and the WBCs, but they are somehow related because they also excrete waste but only on the oxygen/air that it's receiving and releasing. Unlike blood cells, they only carry out wastes from foreign agents. The circulatory system is also composed of blood vessels which is a cycle significant for carrying out the oxygen and carbon dioxide in a proper order.