The Incredible Journey

The left side of the heart was bigger than the right side. This is because the left side of the heart, has the job of pumping the blood to all the body. The right side of the heart is smaller as it has only one job, which is to pump blood to the lungs. The atrium are very flimsy in comparison to the ventricles. The atria are small and flap like because it collects blood, whereas the ventricles actually pump the blood, so they are stronger muscles. This was why they were large and took up most of the room in the heart. There were two arteries coming out the top of the heart. These are the aorta and the pulmonary artery. Their elastic walls are very thick so that they can withstand high levels of blood pressure.

Inside our body there is a powerful muscular pump, which is known as the one of the main organs in the human body. This hollow, cone shaped, pump lies slightly left within the center of the chest called our heart. The heart is made up of different structures and actions in order for it to work, combined with a network of blood vessels form what we know as the cardiovascular system.

The heart is a muscular organ that rests behind the sternum. The heart pumps blood through a network of arteries and veins that makeup the cardiovascular system. (The Heart (Human Anatomy)

• Pulse Oximetry - Tests the percentage of oxygen in the blood. 95% or more is a normal level,

The cardiovascular system, however, would not be able to effectively complete these functions without help from what is sometimes referred to as the body’s hardest-working organ- the heart. Approximately the size of a fist, the heart is contains four chambers (the uppermost are called the atria and the lowermost are called the ventricles) and four valves. Additionally, the heart is surrounded by the pericardium, a structure that serves to protect the heart, keep the heart stabilized in the chest, and

➢ Air next enters the trachea, which divides into two primary bronchi. As the bronchi enter the lungs they continue to divide into smaller bronchi, and ultimately into terminal bronchioles.

The act of breathing starts from the mouth. You breathe in air through your mouth and nose, and it travels through the back of your throat and down your wind pipe or trachea. Your trachea the divides itself into air passages called bronchial tubes. For your Lungs to perform at their best these passages needed to be clear during inhaling and exhaling. And free from mucus swelling and inflammation.

The heart is a very strong muscle that has one major job. The heart’s job is to pump blood throughout the entire body. The heart is made up of 4 chambers, and 4 valves. There is the right and left atrium, and a right and left ventricle. The atriums are the superior chambers, and the ventricles are inferior chambers. The left ventricle is the most important, because that is where the blood travels through to go to the aorta, and eventually the rest of the body (Taylor 2015).

The human body comprises of two respiratory sponges called lungs. The left lung is slightly smaller than the right as it makes room for placement of the heart. Due to this slightly smaller size, it only contains two lobes whereas the right lung has 3 lobes. Both lungs are host to the network of air sacs or alveoli which transport the air from the outside environment to the external and internal respiration processes.

Unique cell-types are needed to perform the functions of the lung because the lung itself provides a unique function for the human body. As previously stated, when cells can no longer provide a function on their own, they develop into tissues unique to the role required of them. When they need to advance from there, they form into organs that provide the overall function that is needed for the homeostasis of the body, as a result of all these cell types working together. The lung is built of all four tissues types: epithelial, connective, muscle and nervous. All of them are comprised of their own cell types that had evolved over time. The epithelial tissues functions to protect the lung to absorb moisture, help regulate temperature and contractibility. The connective

The chest contains two lungs, one lung on the right side of the chest, the other on the left side of the chest. Each lung is made up of sections called lobes. The lungs are soft and protected by the ribcage. The purpose of the lungs is to bring oxygen into the body and to remove carbon dioxide. Oxygen is a gas that provides us with energy, while carbon dioxide is a waste product or “exhaust” of the body.

The lungs are very vascular organs, meaning they receive a very large blood supply. This is because the pulmonary arteries, which supply the lungs, come directly from the right side of your heart. They carry blood which is low in oxygen and high in carbon dioxide into your lungs so that the carbon dioxide can be blown off, and more oxygen can be absorbed into the bloodstream. The newly oxygen-rich blood then travels back through the paired pulmonary veins into the left side of your heart. From there, it is pumped all around your body to supply oxygen to cells and organs. The lungs are covered by smooth membranes that we call pleurae (Shier, Lewis, & Butler, 2006). The pleurae have two layers, a 'visceral' layer which sticks closely to the outside surface of your lungs, and a 'parietal' layer which lines the inside of your chest wall (ribcage). The pleurae are important because they help you breathe in and out smoothly, without any friction. They also make sure that when your ribcage expands on breathing in, your lungs expand as well to fill the extra space (VanPutte el al.,

The heart is located in the chest between the lungs behind the sternum and above the diaphragm. It is surrounded by the pericardium. Its size is about that of a fist, and its weight is about 250-300 g. Its center is located about 1.5 cm to the left of the midsagittal plane. Located above the heart are the great vessels: the superior and inferior vena cava, the pulmonary artery and vein, as well as the aorta. The aortic arch lies behind the heart. The esophagus and the spine lie further behind the heart.

An Overview of The Human Heart- Information on what the human heart is and how it functions.

We each have two lungs, a left lung and a right lung. These are divided up into 'lobes', or big sections of tissue separated by 'fissures' or dividers. The right lung has three lobes but the left lung has only two, because the heart takes up some of the space in the left side of our chest. The lungs can also be divided up into even smaller portions, called 'bronchopulmonary segments'.