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Muscle Tissues • Muscle tissue is like what part of an airplane? • Contract in response to stimulus Æ muscle fibers shorten Æ move body parts • Types: – Skeletal – Smooth – Cardiac Skeletal Muscle Tissue • Cells are long and threadlike • Cells have striations: alternating light and dark cross‐markings • Each cell has many nuclei Skeletal (Cont’d) • Fun fact: 40% of the body is skeletal muscle • Where? Muscles that attach to bone and are moved by conscious, voluntary, effort • Functions: Muscles with skeletal tissue move head, trunk, limbs; facial expressions, write, talk, sing, beat Whitefield in the game tonight, etc… Smooth • Question: Is this tissue striated? • Smooth = no striations • Shorter than skeletal, spindle shaped, one central nucleus Smooth (Cont’d) • Fun fact: 10% of the body is smooth muscle • Where? Walls of hollow internal organs (stomach, intestine, bladder, uterus, blood vessels) • Functions: Movement of substance within the body (waste, blood, etc) Cannot be contracted consciously – involuntary – Ex of involuntary: smooth muscle moves food through digestive tract Cardiac • Cells are striated and branched Æ make complex networks, one nucleus • Can you control when your heart contracts or beats? Involuntary Cardiac (cont’d) • Where? Only in the heart • Function: pumps blood through the heart chambers and into blood vessels Nervous tissue • Nervous tissue is like what part of an airplane? • Cells are neurons – Support cells are neuroglial cells Nervous tissue (cont’d) • Where? Brain, spinal cord, nerves • FUNCTIONS‐ 1. NEURONS: • • Sense changes in surroundings and transmit nerve impulses to other neurons, muscles, or glands Coordinate, regulate, integrate body functions Nervous tissue (cont’d) 2. NEUROGLIAL CELLS: • Support and bind parts of nervous tissue • Supply nutrients to neurons (connect to blood vessels) Based on what you know of nervous and muscle tissue… • Complete this table in pairs: Type Function Location Skeletal Gross body mvmt Attached to skeleton Smooth Mvmt of substance in body Walls of hollow organs, blood vessels Cardiac Mvmt of blood Heart Nervous Neuron: coordination/integration/control Neuroglial: provide nutrients/structure for neurons Brain, Spine, Nerves Recap • On a sheet of scrap paper: For each slide, write the type of muscle or nervous tissue and explain why. 1. 2. 3. 4. 5.
