BIOL121 Lecture Notes - Lecture 13: Titin, Acetylcholine, Myofilament
27 Aug 2018
School
Department
Course
Professor
Document Summary
Hypertrophy (increased use: increase of tissue size due to increase in size of cells. Hyperplasia: increase of tissue size due to increase in cell number. Atrophy (decreased use: decrease in tissue size due to decrease in size of cells. Severe damage can lead to it not being able to replicate. Damage leads to fibrosis; therefore, scar tissue. No regeneration in cardiac muscle means fibrosis. Located in walls of hollow internal structure: blood vessels changes the diameter, stomach, intestine, bladder and uterus, airway to lungs, hair follicles, pupil. Involuntary control: spontaneous rhythmic cycles (pacesetter cells, influenced by hormones, stretching and ans. Influenced by the ans and hormones: sympathetic leads to increased heart rate, parasympathetic leads to decrease in heart rate, adrenaline leads to increased heart rate. Most abundant muscle type in the body. Voluntary control: controlled by nerves of the central nervous system (brain and spinal cord, contraction = shortened muscle, relaxation = lengthened muscle.
