1. Muscle and Nervous Tissue Pages 97-101

2.  Function: ◦ contract (shorten) to produce movement  Three types: 1.Skeletal muscle 2.Cardiac muscle 3.Smooth muscle © 2015 Pearson Education, Inc.

3.  Voluntary (consciously) control  Attach to bones or skin  Produce: ◦ gross body movements ◦ facial expressions  Cell Characteristics: ◦ Striations (stripes) ◦ Multinucleate (more than one nucleus) ◦ Long, cylindrical shape © 2015 Pearson Education, Inc.

4. Figure 3.20a Type of muscle tissue and their common locations in the body. Nuclei Part of muscle fiber Photomicrograph: Skeletal muscle (195×) (a) Diagram: Skeletal muscle

5.  Involuntar control  only in the heart  Pumps blood through blood vessels  Characteristics of cardiac muscle cells ◦ Striations ◦ One nucleus, short, branching cells  Look somewhat like bamboo ◦ Intercalated discs:  Areas between cells which contain gap junctions to connect cells together so that the impulse spreads across the heart synchronously © 2015 Pearson Education, Inc.

6. Figure 3.20b Type of muscle tissue and their common locations in the body. Intercalated discs Nucleus Photomicrograph: Cardiac muscle (475×) (b) Diagram: Cardiac muscle

7. Compare the two- note the differences SkeletalCardiac

8.  Involuntary control  Location: where constricting and enlarging is required ◦ walls of hollow organs  Peristalsis: a wavelike activity that moves digested material through the small intestine ◦ blood vessels  Characteristics: ◦ No visible striations ◦ Single nucleus ◦ Spindle-shaped cells © 2015 Pearson Education, Inc.

9. Figure 3.20c Type of muscle tissue and their common locations in the body. Smooth muscle cell Nuclei Photomicrograph: Sheet of smooth muscle (285×) (c) Diagram: Smooth muscle

10.  Two groups of cells: ◦ Neurons ◦ Neuroglia (glial cells)  these insulate, protect, and support neurons  Function: receive and conduct electrochemical impulses to and from body parts ◦ Irritability ◦ Conductivity © 2015 Pearson Education, Inc.

11. Figure 3.21 Nervous tissue. Brain Spinal cord Nuclei of supporting cells Cell body of neuron Neuron processes Nuclei of supporting cells Neuron processes Cell body of neuron Diagram: Nervous tissue Photomicrograph: Neurons (320×)