BIOL 102 Lecture Notes - Lecture 14: Ligand-Gated Ion Channel, Motor Neuron, Signal Transduction
Document Summary
Breathing mechanism controlled by feedback to the medulla is more sensitive to increased levels of co2 in arterial blood than decreased amounts of o2. Pco2 is the primary metabolic feedback information for breathing. Pco2 of blood is higher than in extracellular fluid co2 diffuses out of the blood co2 interacts with h2o h2co3 h+ and hco3- h+ ions stimulate chemosensitive cells increase respiratory gas exchange. Sensitivity to blood po2 resides in nodes of neural tissue on the large blood vessels leaving the heart (aorta and carotid arteries) Nervous system: know the parts and functions of a neuron. Cell body: contains the nucleus and most cell organelles. Axon: conducts action potentials away from the cell body. Motor end place: postsynaptic membrane of the neuromuscular junctions is a modified part of the muscle cell plasma membrane. Appears as a depression in the muscle cell membrane. Synapses can be fast or slow: two categories of receptors.
