Which organ covers the entire body and protects it

The nine major organ systems in the human body are the integumentary system, the musculoskeletal system, the respiratory system, the circulatory system, the digestive system, the excretory system, the nervous system, the endocrine system, and the reproductive system. human body, the physical substance of the human organism, composed of living Human see see For detailed coverage of the body’s biochemical see see Many entries describe the body’s major structures. For example, see Learn how a failure in the endocrine system may affect digestive, circulatory, and excretory systems The body includes nine major organ systems, each composed of various organs and tissues that work together as a functional unit. The chief constituents and prime functions of each system are summarized below. (1) The

Human body systems are comprised of many parts, from the smallest cells to the most robust bones. What makes the body amazing is how these parts come together to function as a whole. The smallest units in the body are cellular, and cells cluster to create tissues. When tissues coalesce, they create organs. Although organs in the body may seem separate, they all cooperate. A good example of cooperating organs are the stomach and intestines, which digest food. When sets of organs work together, they are called an organ system or body system. Major external human body parts include the head, neck, shoulders, trunk (thorax, abdomen, pelvis, and back), and the upper and lower limbs. Internal structures include arteries, veins, bones, joints, connective tissue, epithelial tissue, muscles, nerves, organs, and adipose tissue. An illustrated diagram of the human body, with an X-ray view showing multiple organs, structures, and organ systems. Cardiovascular & Endocrine Your body is an amazing machine, with many systems and organs that must all work together to keep you healthy. Let's look at the body systems in detail, examine their functions, and learn which organs are in each. The cardiovascular system is responsible for circulating blood throughout your body. The most important organ in the cardiovascular system is the heart. Your heart contracts about once a second for your entire life, and you can't live more than a few minutes if it stops working properly. In addition to the h...

Some organs belong to more than one organ system. The pancreas, for example, can be considered a part of the digestive system because it secretes enzymes that help the body break down fat, protein, and starch. It is also part of the endocrine system because it produces hormones that help regulate blood sugar. Urinary (Excretory) System The urinary system is made up of the: • Institute for Quality and Efficiency in Health Care. • National Cancer Institute. • National Library of Medicine: MedlinePlus. • MedlinePlus. • Endocrine Society. • National Institute of Diabetes and Digestive and Kidney Diseases. • Breit S, Kupferberg A, Rogler G, Hasler G. Front Psychiatry. 2018;9:44. doi:10.3389/fpsyt.2018.00044 • Endocrine Society. • National Cancer Institute. • National Cancer Institute. • National Cancer Institute. • National Cancer Institute. • Sweeney MD, Zhao Z, Montagne A, Nelson AR, Zlokovic BV. Physiol Rev. 2019;99(1):21-78. doi:10.1152/physrev.00050.2017 • MedlinePlus. • MedlinePlus. • Institute for Quality and Efficiency in Health Care.

Function What does the skeletal system do? The skeletal system has many functions. Besides giving us our human shape and features, it: • Allows movement: Your skeleton supports your body weight to help you stand and move. Joints, connective tissue and muscles work together to make your body parts mobile. • Produces blood cells: Bones contain bone marrow. Red and white blood cells are produced in the bone marrow. • Protects and supports organs: Your skull shields your brain, your ribs protect your heart and lungs, and your backbone protects your spine. • Stores minerals: Bones hold your body’s supply of minerals like calcium and vitamin D. Anatomy What are the parts of the skeletal system? The skeletal system is a network of many different parts that work together to help you move. The main part of your skeletal system consists of your bones, hard structures that create your body’s framework — the skeleton. There are 206 bones in an adult human skeleton. Each bone has three main layers: • Periosteum: The periosteum is a tough membrane that covers and protects the outside of the bone. • Compact bone: Below the periosteum, compact bone is white, hard, and smooth. It provides structural support and protection. • Spongy bone: The core, inner layer of the bone is softer than compact bone. It has small holes called pores to store marrow. The other components of your skeletal system include: • Cartilage: This smooth and flexible substance covers the tips of your bones where they m...

The human heart is a finely-tuned instrument that serves the whole body. It is a muscular organ around the size of a closed fist, and it sits in the chest, slightly to the left of center. The heart beats around The heart sends deoxygenated blood to the lungs, where the blood loads up with oxygen and unloads carbon dioxide, a waste product of metabolism. Together, the heart, blood, and blood vessels — arteries, capillaries, and veins — make up the circulatory system. In this article, we explore the structure of the heart, how it pumps blood around the body, and the electrical system that controls it. Below is an interactive 3D model of the heart. Explore the model using your mouse pad or touchscreen to learn more. The heart consists of • The atria: These are the two upper chambers, which receive blood. • The ventricles: These are the two lower chambers, which discharge blood. A wall of tissue called the septum separates the left and right atria and the left and right ventricle. Valves separate the atria from the ventricles. The heart’s walls consist of three layers of tissue: • Myocardium: This is the muscular tissue of the heart. • Endocardium: This tissue lines the inside of the heart and protects the valves and chambers. • Pericardium: This is a thin protective coating that surrounds the other parts. • Epicardium: This protective layer consists mostly of connective tissue and forms the innermost layer of the pericardium. The rate at which the heart contracts depends on m...

Anatomy What are the layers of the skin? Three layers of tissue make up the skin: • Epidermis, the top layer. • Dermis, the middle layer. • Hypodermis, the bottom or fatty layer. What does the epidermis (top layer of skin) do? Your epidermis is the top layer of the skin that you can see and touch. Keratin, a protein inside skin cells, makes up the skin cells and, along with other proteins, sticks together to form this layer. The epidermis: • Acts as a protective barrier: The epidermis keeps bacteria and germs from entering your body and bloodstream and causing infections. It also protects against rain, sun and other elements. • Makes new skin: The epidermis continually makes new skin cells. These new cells replace the approximately 40,000 old skin cells that your body sheds every day. You have new skin every 30 days. • Protects your body: Langerhans cells in the epidermis are part of the body’s • Provides skin color: The epidermis contains melanin, the pigment that gives skin its color. The amount of melanin you have determines the color of your skin, hair and eyes. People who make more melanin have darker skin and may tan more quickly. What does the dermis (middle layer of skin) do? The dermis makes up 90% of skin’s thickness. This middle layer of skin: • Has collagen and elastin: Collagen is a protein that makes skin cells strong and resilient. Another protein found in the dermis, elastin, keeps skin flexible. It also helps stretched skin regain its shape. • Grows hair: ...

Your heart is the main organ of your cardiovascular system, a network of blood vessels that pumps blood throughout your body. It also works with other body systems to control your heart rate and blood pressure. Your family history, personal health history and lifestyle all affect how well your heart works. Overview What is the heart? The heart is a fist-sized organ that pumps blood throughout your body. It's the primary organ of your circulatory system. Your heart contains four main sections (chambers) made of muscle and powered by electrical impulses. Your brain and What does a heart diagram look like? The inside and outside of your heart contain components that direct blood flow: Inside of the Heart Outside of the Heart Function What is the heart’s function? Your heart’s main function is to move blood throughout your body. Your heart also: • Controls the rhythm and speed of your • Maintains your How does your heart work with other organs ? Your heart works with other body systems to control your heart rate and other body functions. The primary systems are: • Nervous system: Your • Endocrine system: Your Anatomy Where is your heart located? Your heart is located in the front of your chest. It sits slightly behind and to the left of your sternum (breastbone). Your ribcage protects your heart. What side is your heart on? Your heart is slightly on the left side of your body. It sits between your right and left How big is your heart? Everyone’s heart is a slightly different s...