ch. 4 part 4

Ch. 4 Part 4

Muscular tissueNervous tissue

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

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

Skeletal Muscle Tissue

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

Cardiac Muscle Tissue

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

Smooth Muscle Tissue

Checkpoint

• Which muscles are striated and which are smooth?

• Which types of muscular tissue have gap junctions?

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

Nervous Tissue