BIOL 121 Lecture Notes - Lecture 22: Endoplasmic Reticulum, Pulmonary Circulation, Cardiac Muscle
Document Summary
Most calcium comes from outside the cell) less control (everyone would have to stand up at one time simultaneously) Sarcomeres, sarcoplasmic reticulum and extracellular give majority of calcium. Few gap junctions, each muscle acts more independently. More control in multiunit (everyone can stand up even at different times) restricted to nerve and hormone stimulation, Muscle tone- slight contraction that"s generated so that muscle is in a ready state to go, pull stretch out, contraction will show outward tension and movement, cardiac muscle doesn"t have this. Cardiovascular system- main system for moving materials through the body. Blood- mostly water separates into main components when centrifuged. Separates into plasma and erythrocytes (red blood cells, primary purpose to carry oxygen), and leukocytes (white blood cells, main function is immunity) and platelets (involved in coagulation to prevent blood loss) The blood in the lungs is a pulmonary circulation and pumps into the systems ic circulation. Blood will only go to one at a time.
