BIOL 1201 : Final Exam Study Guide
Document Summary
You can prevent the re-uptake & prevent the breakdown. Action potentials in the optic nerve have over 100,000 the energy of the photons of light that triggered them. >channels in membrane transport na+ and ca++ ions. >ca++ ions bind to calmodulin (cam) which does two things. *each myofibril is composed of a series of sarcomeres. >this causes a shape change in the myosin and that shortens the myofibril. >estrogen can diffuse easily because non-polar molecules can pass through the plasma membrane. >steroids bind to intracellular receptors, which can then bind to, and regulate, the expression of genes. >thyroid hormones bind to intracellular receptors, because they are able to pass through the plasma membrane. >a target cell must have a receptor for the chemical signal. >a hormone is a compound that is secreted in one part of the body and travels through the bloodstream to another part of the body where it has an effect.
