explain the stucture and function of the heart and lungs and why they are good at it
We do not do your homework for you. Here are some sites that will be very helpful.
http://www.google.com/search?hl=en&ie=ISO-8859-1&fkt=2031&fsdt=13063&q=Structure+and+function+of+heart&btnG=Google+Search&aq=f&oq=
http://www.google.com/search?hl=en&ie=ISO-8859-1&q=Structure+and+function+of+lungs&btnG=Search
still cant find out why they are suited to there function
The heart and lungs are vital organs in the human body that work together to ensure the delivery of oxygen and nutrients to the cells while removing waste products. Let me explain the structure and function of each organ and why they are proficient at their tasks.
Structure and Function of the Heart:
The heart is a muscular organ located in the chest cavity, slightly left of the midline. It consists of four chambers: two atria on the top and two ventricles on the bottom. The right side of the heart pumps deoxygenated blood to the lungs for oxygenation, while the left side pumps oxygenated blood to the rest of the body.
The heart functions as a pump due to its specialized structure. It is made up of cardiac muscle tissue, which is highly resistant to fatigue and can contract rhythmically. The contraction of the heart muscles is coordinated by an electrical conduction system, ensuring a synchronized pumping action.
When blood enters the atria, they contract, pushing blood into the ventricles. The atrioventricular valves then prevent the backflow of blood from the ventricles to the atria. Next, the ventricles contract, forcing open the semilunar valves and forcing blood out of the heart into the pulmonary artery and the aorta.
The heart's function is to pump blood throughout the body, supplying oxygen and nutrients to the cells. It does so by efficiently contracting and relaxing, maintaining a continuous circulation throughout the body.
Structure and Function of the Lungs:
The lungs are located in the thoracic cavity and are protected by the ribcage. Each lung is divided into lobes and consists of millions of tiny air sacs called alveoli.
The primary function of the lungs is to facilitate the exchange of oxygen and carbon dioxide between the air and the blood. Inhalation brings oxygen-rich air into the lungs, while exhalation removes carbon dioxide that has built up in the bloodstream.
The structure of the lungs enables efficient gas exchange. The alveoli have thin walls and are surrounded by an extensive network of tiny blood vessels called capillaries. This arrangement allows for a large surface area for oxygen to diffuse into the bloodstream and for carbon dioxide to leave the blood and enter the lungs to be exhaled.
Additionally, the lungs are covered by a lubricating membrane called the pleura, which reduces friction during breathing. The expansion and contraction of the diaphragm muscle enable the rhythmic movement of the lungs, allowing for the intake of fresh air and the elimination of waste gases.
Why are the Heart and Lungs Proficient at Their Tasks?
The heart and lungs are highly remarkable organs due to their efficient design and specialized functionalities:
1. Adaptability: The heart and lungs can adjust their pace and capacity to meet the body's demands during rest and exercise, efficiently maintaining a balance between oxygen and carbon dioxide levels.
2. Synchronization: The electrical conduction system of the heart ensures that its chambers contract in a synchronized manner, maximizing efficiency and optimizing blood flow throughout the body.
3. Surface Area: The lungs possess a vast surface area due to the presence of millions of alveoli, allowing for a substantial gas exchange and efficient absorption of oxygen into the bloodstream.
4. Circulation: The heart's continuous and rhythmic pumping action ensures a constant circulation of blood, providing oxygen and nutrients to every cell and removing waste products.
In conclusion, the heart and lungs are exceptionally good at their functions due to their specialized structures, coordinated actions, and adaptability. Their combined efforts ensure efficient oxygenation of the blood and transportation of vital substances throughout the body.