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Body Organization & Homeostasis

Body Organization & Homeostasis. (p.468). There are 4 levels of organization in the human body: Cells Tissues Organs Systems. Tissue – A group of cells working together. Tissues. There are 4 types of tissues in the human body. Muscle Tissue Nervous Tissue Connective Tissue

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Body Organization & Homeostasis

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  1. Body Organization & Homeostasis (p.468)

  2. There are 4 levels of organization in the human body: • Cells • Tissues • Organs • Systems

  3. Tissue – A group of cells working together

  4. Tissues • There are 4 types of tissues in the human body. • Muscle Tissue • Nervous Tissue • Connective Tissue • Epithelial Tissue

  5. Muscle Tissue • Muscle Tissue - Muscle tissue is a specialized tissue that can contract.  Muscle tissue contains the specialized proteins actin and myosin that slide past one another and allow movement.  Examples of muscle tissue are contained in the muscles throughout your body. • Function – Makes parts of your body move • Examples – biceps, hamstrings, gluetus maximus

  6. Nervous Tissue • Nerve Tissue - Nerve tissue contains two types of cells: neurons and glial cells.  Nerve tissue has the ability to generate and conduct electrical signals in the body.  These electrical messages are managed by nerve tissue in the brain and transmitted down the spinal cord to the body. • Function – carries electrical messages back and forth between the brain and every other part of the body • Examples – brain, nerves, spinal cord

  7. Connective Tissue • Connective Tissue - There are many types of connective tissue in the body.  Generally speaking, connective tissue adds support and structure to the body.  Most types of connective tissue contain fibrous strands of the protein collagen that add strength to connective tissue.  Some examples of connective tissue include the inner layers of skin, tendons, ligaments, cartilage, bone and fat tissue.  In addition to these more recognizable forms of connective tissue, blood is also considered a form of connective tissue. • Function – provides support for the body and connects all of its parts • Examples – bone, fat, tendons, blood

  8. Epithelial Tissue • Epithelial Tissue - The cells of epithelial tissue pack tightly together and form continuous sheets that serve as linings in different parts of the body.  Epithelial tissue serve as membranes lining organs and helping to keep the body's organs separate, in place and protected.  Some examples of epithelial tissue are the outer layer of the skin, the inside of the mouth and stomach, and the tissue surrounding the body's organs. • Function – Covers the surface of the body, inside and out • Examples – skin’s outer layer, inside mouth & stomach

  9. Homeostasis • Homeostasis – maintaining stable internal conditions Examples – • Regulation of body temperature (sweating, chill bumps) • Maintain proper hydration (feeling thirsty)

  10. Examples of Homeostasis • Regulation of body temperature (sweating, chill bumps)

  11. Examples of Homeostasis • Maintain proper hydration (feeling thirsty)

  12. Stress • Stress – the body reacting to potentially threatening, challenging, or disturbing events

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