Animal Body Structure Cell Tissue Organ system Organism
Animal Body Structure Cell Tissue Organ system Organism
Four Major Tissues Types • • Epithelial Muscle Connective Nerve
Epithelial Tissue • Cover body cavities and surfaces – Protection • Example – skin – Secretion • Example – salivary glands – Absorption • Example – small intestine • Constantly being replaced
Muscle Tissue • Contain contractile fibers – Proteins - actin and myosin
Muscle Tissue Smooth Muscle • Arteries and veins • Digestive tract • Involuntary Skeletal Muscle • Move bones • Voluntary Cardiac Muscle • Heart • Controlled by pacemaker
Connective Tissue • Loose connective tissue – Supports and nourishes epithelium • Fibrous connective tissue – Bone, tendons, ligaments, cartilage and bone – Support, protection and movement • Specialized – Adipose (fat) – fuel storage – Blood and lymph – transport and immunity
Connective Tissue Cartilage Fibrous Loose Adipose Blood Bone. Cells - Fat
Nerve Tissue • Neurons – – Transport signals Senses Information processing Control movement Transmit Receive Pass Chemical chemical electrical signal to other from alongcell • Glial Cells Axon
Groups of Tissues Form an Organ
Many Different Cell Types from One Genome • Pattern of genes determines cell type • Cells work together in a tissue – Cell communication – Limit growth – Repair damage tissue
Abnormal Gene Expression • Cancer – Abnormal tissue – Abnormal cell communication – Abnormal growth
Homeostasis • Maintaining a constant internal environment – Dynamic Equilibrium
Feedback Systems • Negative feedback – Maintains constant conditions – Dynamic equilibrium • Positive feedback – Enhances response
Negative Feedback • Three Parts – Sensor – Control Center – Effector
Negative Feedback
Positive Feedback
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