Presentation is loading. Please wait.

Presentation is loading. Please wait.

Muscle and Nervous Tissue

Similar presentations


Presentation on theme: "Muscle and Nervous Tissue"— Presentation transcript:

1 Muscle and Nervous Tissue
Pages

2 Muscle Tissue Function: Three types:
contract (shorten) to produce movement Three types: Skeletal muscle Cardiac muscle Smooth muscle © 2015 Pearson Education, Inc.

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

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

7 Compare the two- note the differences
Skeletal Cardiac

8 Smooth Muscle Tissue Involuntary control Characteristics:
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 (c) Diagram: Smooth muscle
Figure 3.20c Type of muscle tissue and their common locations in the body. Smooth muscle cell Nuclei (c) Diagram: Smooth muscle Photomicrograph: Sheet of smooth muscle (285×)

10 Nervous Tissue 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 7.4a Structure of a typical motor neuron.
Dendrite Mitochondrion Cell body Axon Nucleus One Schwann cell Node of Ranvier Axon terminal Schwann cells, forming the myelin sheath on axon (a)

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

13 Support Cells: Neuroglia
Astrocytes Brace/anchor neurons, provide chemical barrier Most abundant glial cells Microglia Destroy threatening particles/cells; phagocytes Ependymal cells Line ventricles and central canal; cilia circulate CSF Oligodendrocytes Produce myelin sheath around axons (in the CNS) © 2015 Pearson Education, Inc.

14 Support Cells: PNS glial cells
Satellite cells Protect neuron cell bodies Schwann cells Form myelin sheath around axons (in the PNS) © 2015 Pearson Education, Inc.


Download ppt "Muscle and Nervous Tissue"

Similar presentations


Ads by Google