Human skeleton | Parts, Functions, Diagram, & Facts | Britannica
网页2024年9月14日 · human skeleton, the internal skeleton that serves as a framework for the body. This framework consists of many individual bones and cartilages. There also are bands of fibrous connective tissue—the ligaments and the tendons—in intimate relationship with the parts of the skeleton.
Human body | Organs, Systems, Structure, Diagram, & Facts
网页2024年9月21日 · Characteristic of the vertebrate form, the human body has an internal skeleton with a backbone, and, as with the mammalian form, it has hair and mammary glands. Learn more about the composition, form, and physical adaptations of …
Bone | Definition, Anatomy, & Composition | Britannica
网页2024年9月15日 · Bone, rigid body tissue consisting of cells embedded in an abundant hard intercellular material. Bone tissue makes up the individual bones of the skeletons of vertebrates. Its two principle components are collagen and calcium phosphate. Learn more about the composition and function of bone.
Skeletal system parts and functions | Britannica
网页Bone, rigid body tissue consisting of cells embedded in an abundant hard intercellular material. The two principal components of this material, collagen and calcium phosphate, distinguish bone from such other hard tissues as chitin, enamel, and shell.
Human muscle system | Functions, Diagram, & Facts | Britannica
网页2024年9月9日 · Human muscle system, the muscles of the human body that work the skeletal system, that are under voluntary control, and that are concerned with movement, posture, and balance.
human body systems - Encyclopedia Britannica
网页Each of the major systems of the body is essential to the survival of the human organism, and each serves as a critical companion to the others. The muscle and skeletal systems, for example, act together to move the body.
Bone - Structure, Function, Types | Britannica
网页2024年9月15日 · Depending on how the protein fibrils and osteocytes of bone are arranged, bone is of two major types: woven, in which collagen bundles and the long axes of the osteocytes are randomly oriented, and lamellar, in which both the fibrils and osteocytes are aligned in clear layers.
Human skeleton - Axial, Visceral, Bones | Britannica
网页2024年9月14日 · Human skeleton - Axial, Visceral, Bones: The cranium—the part of the skull that encloses the brain—is sometimes called the braincase, but its intimate relation to the sense organs for sight, sound, smell, and taste and to other structures makes such a designation somewhat misleading.
Human body - Anatomy, Physiology, Development | Britannica
网页2024年9月21日 · They form bones, muscles, and the deeper, leathery part of the skin. Dorsally they form bony arches protecting the spinal cord, and ventrally the ribs protecting the alimentary canal and heart. Thus they form the body wall and the limbs—much the weightier part of the body.
bone summary | Britannica
网页Bones serve as the body’s supporting framework, provide muscle-attachment points for movement, protect the internal organs, house the blood-cell formation system (red bone marrow), and hold about 99% of the calcium vital to many body processes.
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