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Muscle Tissue Muscle Tissue Types • Function is to produce movement • Three types • Skeletal muscle – Under voluntary control – Contracts to pull on bones or skin – Produces gross body movements or facial expressions – Characteristics of skeletal muscle cells – Skeletal muscle – Cardiac muscle – Smooth muscle • Striated • Multinucleate (more than one nucleus) • Long, cylindrical Muscle Tissue Types Skeletal tissue (striated) 40X 1000X Figure 3.20a Muscle Tissue Types Muscle Tissue Types • Cardiac muscle – Under involuntary control – Found only in the heart – Function is to pump blood – Characteristics of cardiac muscle cells • Cells are attached to other cardiac muscle cells at intercalated disks • Striated • One nucleus per cell Figure 3.20b 1 Cardiac Muscle Tissue Types • Short, cylindrical cells with single nucleus • Smooth muscle – Under involuntary muscle – Found in walls of hollow organs such as stomach, uterus, and blood vessels – Characteristics of smooth muscle cells 400X 40X 100X • No visible striations • One nucleus per cell • Spindle-shaped cells Muscle Tissue Types Smooth muscle • Looks like flowing river, lots of nuclei 40X 100X Figure 3.20c 400X Nervous Tissue Nervous Tissue • Composed of neurons and nerve support cells • Function is to send impulses to other areas of the body – Irritability – Conductivity Figure 3.21 2 Nervous tissue (spinal cord, cs) Nervous tissue (cerebellum) 400X 40X 100X 40X Glandular Epithelium 400X 100X Parathyroid • Gland – One or more cells responsible for secreting a particular product • Two major gland types – Endocrine gland • Ductless since secretions diffuse into blood vessels • All secretions are hormones – Exocrine gland 100X 400X • Secretions empty through ducts to the epithelial surface • Include sweat and oil glands Pituitary 100X 400X 3