BIOL 2021 Lecture Notes - Lecture 6: Red Color, Sliding Filament Theory, Endoplasmic Reticulum

• School: University of Windsor
• Department: Biological Sciences
• Course: BIOL 2021
• Professor: Sara Mcnorton

Document Summary

Muscle is the primary tissue in the heart (cardiac) and the walls of hollow organs (smooth), and makes up nearly half of the body"s total mass. Functions of muscle tissue: producing body movements, stabilizing body positions/posture, movement of substances within the body. Blood, lymph, urine, air, food, fluids, sperm, etc: producing heat through involuntary contractions of skeletal muscle (shivering) Muscle tone: involuntary contraction of a small number of motor units. Does not produce movement: essential for maintaining body posture, important in maintaining blood pressure in the body. The tone of smooth muscles in the walls of blood vessels. Muscle tissue is characterized by two main features: presence or absence of striations, control is either voluntary or involuntary. There are three types of muscle tissue: skeletal, cardiac and smooth. Skeletal muscle: long, multinucleated cells, attaches to bone, skin or fascia, striated light and dark bands are visible under a microscope, voluntary control of contraction and relaxation.