BIOL 030 Lecture Notes - Lecture 7: Skeletal Muscle, Myocyte, Dermis

• School: College of The Sequoias
• Department: Biology (BIOL)
• Course: BIOL 030
• Professor: puhl

Document Summary

Skeletal - voluntary, made of muscle fibres containing striations (dark and light bands) Myocytes (cardiocytes) are branched, shorter than skeletal muscle fibres. Contain one nucleus, intercalated discs join cardiocytes end to end, striated and involuntary. Most is visceral muscle, making up parts of the walls of hollow organs. Integumentary system: skin and sccessory organs, hair, nails, cutaneous glands. Exposed to radiation, trauma, infection, injurious chemicals. Receives more med treatment than other organs. From dermis outwards, cells become flat and die. Only place that cells divide in hypodermis. From 0. 2 mm (eyelids) to 4 mm (palms, soles) thick. Well supplied with blood vessels, sweat glands, sebaceous glands, and nerve. Skeletal muscles attach to this tissue in the face. Wavy, conspicuous boundary with the superficial epidermis endings. Dermal papillae upward finger like extensions of dermis. Epidermal ridges are downward waves of dermis. Prominent waves on fingers create friction ridges fingerprint. Thin zone of areolar tissue in and near dermal papilla.