Muscle Tissue Muscle tissue is highly vascular & highly cellular Less matrix = more flexibility More blood flow = more ATP made Elongated shape Actin & myosin – contractile myofilaments

Muscle Tissue Slide 3.64 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Function is to produce movement  Three types  Skeletal muscle  Cardiac muscle  Smooth muscle

Muscle Tissue Types Slide 3.65 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Skeletal muscle  Voluntary control  Cells attach to connective tissue  Cells are striated (striped)  Cells have more than one nucleus (multinucleate) Figure 3.19b

Muscle Tissue Types Slide 3.67 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Smooth muscle  Involuntary muscle  Surrounds hollow organs  Attached to other smooth muscle cells  No visible striations  One nucleus per cell (uninucleate) Figure 3.19a

Muscle Tissue Types Slide 3.66 Copyright © 2003 Pearson Education, Inc. publishing as Benjamin Cummings  Cardiac muscle  Found only in the heart - Function is to pump blood (involuntary control)  Cells attached to other cardiac muscle cells at intercalated disks and split at the bifurcations  Cells are striated  One nucleus per cell Figure 3.19c Bifurcation

Nervous Tissue Consists of brain, spinal cord, nerves Carry electrical signals 2 major cell types: Neurons: generate & conduct electricity Usually nonregenerative Neuroglia: support neurons Brain tumors?

Tissue Repair 1. Regeneration is the replacement of destroyed tissue by proliferation of the same type of cells. 2. Fibrosis is the replacement of destroyed tissue by connective (scar) tissue. 3. The major type of tissue repair that takes place is determined by: a. The type of tissue injured b. The severity of the injury

Muscle, Nervous & Tissue Repair review