1. Ch. 4 Part 4 Muscular tissue Nervous tissue

2. Muscular Tissue Consists of muscle fibers that can use ATP to generate force Function: produces body movements, maintains posture, and generates heat, provides protection 3 types – Skeletal – Cardiac – Smooth

3. Skeletal Muscle Tissue Usually attached to bones Striated – alternating light and dark bands within fibers Voluntary – can be made to contract and relax under conscious control Muscle fiber is cylindrical and has many nuclei

4. Skeletal Muscle Tissue

5. Cardiac Muscle Tissue Forms most of the wall of the heart Striated Involuntary – contraction is not consciously controlled Fibers are branched and have only one nucleus (sometimes two) Attached by intercalated discs with gap junctions and desmosomes

6. Cardiac Muscle Tissue

7. Smooth Muscle Tissue Located in the walls of hollow internal structures like: blood vessels, airways to lungs, stomach, intestines, gallbladder, urinary bladder Nonstriated Involuntary Fiber is long, fat in the middle, and thin at the ends

8. Smooth Muscle Tissue

9. Checkpoint Which muscles are striated and which are smooth? Which types of muscular tissue have gap junctions?

10. Nervous Tissue Consists of neurons and neuroglia Neurons (nerve cells) create electrical signals called action potentials (nerve impulses) Send impulses to other cells of the body Neurons have 3 basic parts – Cell body – Dendrites – Axon

11. Nervous Tissue