HLSC 1200U Lecture Notes - Lecture 3: Heredity, Lysosome, Desmosome
Document Summary
The nerve cell is used to detect changes in the environment, it is to transmit info over long distances. The muscle cell is tiny, long and threadlike. This cell is used to allow movement by the fibers shorten by sliding together. It does not have a nucleus, that gives it that donut shape. This allows it to squeeze through the smallest capillaries. These cells recognize and destroy non-self cells such as cancerous cells and foreign particles. How we define a cell, by the outer layer. Plasma membrane to have an outer boundary that is separating from the external environment. Nuclear envelope separates the nucleus from the cytoplasm. Membranous organelles are sacs and canals separating from the cytoplasm. Referring to the each individual molecule being able to float around slowly; allowed to move around in the plane that they"re in. Double layer of phospholipids, held together by chemical attraction.
