Bio 161

BIO 161 - PSU - EXAM 3 QUESTIONS AND ANSWERS A+ GRADED Gas neurotransmitters dopamine & norepinephrine Secretion processing of converting electrical signal to chemical signal then back to electrical in postsynaptic neuron Synapse Steps 1 - AP reaches postsynaptic terminal 2 - Ca++ voltage gated channels open 3 - Ca++ binds to vesicles to help them burst 4 - Neurotransmitters in vesicles travel through cleft and bind to postsynaptic ligand channels Snare Proteins docking vesi...

BIO 161 EXAM 3 PSU QUESTIONS AND ANSWERS A+ GRADED Secretion converting an electrical signal to a chemical signal -allowing neurons to communicate with each other presynaptic neuron sending neuron postsynaptic neuron receiving neuron Where are neurotransmitters synthesized? How are they transported? -cell body -in vesicles to axon terminals Neurotransmitters are derived from? amino acids like dopamine or norepinephrine -some can be gaseous or made of other chemicals (acetyl...

BIO 161: EXAM 4 QUESTIONS AND ANSWERS A+ GRADED excitability ability to receive and respond to stimuli conductivity ability to propagate electrical signals over membrane contractility ability to shorten and generate force extensibility ability to be stretched without damaging tissue elasticity ability to return back to original shape after being stretched skeletal muscle muscle that attaches to bones via tendons, voluntary movement, striated, multinucleate cardiac muscle pu...

BIO 161 - PSU - EXAM 1 QUESTIONS AND ANSWERS A+ GRADED Electron negatively charged subatomic particle Proton positively charged subatomic particle Neutrons neutral subatomic particle Atomic Number number of protons found in the nucleus of an atom Ion charged atom, uneven number of protons and electrons Cation positively charged ion, loses electrons Anion negatively charged ion, gains electrons Ionic Bond (weakest bond)

BIO 161 PSU EXAM 1 QUESTIONS AND ANSWERS A+ GRADED What is gene expression? What is the first process and where does it occur? What is the second process and where does it occur? Gene expression is the process of making proteins from the instructions (genes) in DNA Process A: replication, DNA to RNA, occurs in nucleus Process B: translation, RNA to protein, occurs in ribosomes in the ER Organelles involved in gene expression and what happens in them 1. Nucleus - production of RNA...

BIO 161 PSU EXAM 4 QUESTIONS AND ANSWERS A+ GRADED What makes up the Central Nervous System (CNS)? brain and spinal cord cell bodies and axons What makes up the Peripheral Nervous System (PNS)? nerves ganglions Another name for sensory neurons afferent neurons Another name for motor neurons efferent neurons What are the two classes of afferent neurons and their direction 1. Somatic - from bones, muscles, skin 2. Visceral - from organs What are the two classes of efferent ...

BIO 161 PSU EXAM 5 QUESTIONS AND ANSWERS A+ GRADED Functions of bone 1. Support - Hold body upright, support muscles and organs 2. Protection - Enclose important organs 3. Movement - Provide attachment sites for muscles 4. Electrolyte and Acid/Base Balance - Stores and releases ions needed by the body - Stores and release salts to buffer the blood 5. Blood Cell Differentiation - Location of bone marrow, the main producer of blood cells Diaphysis (long bone) location shaft of ...

Bio 161 PSU Exam 4 QUESTIONS AND ANSWERS A+ GRADED Excitability ability to respond to stimuli Contractability ability to shorten Conductivity Ability to allow electricity to flow Extensibility ability to be stretched skeletal muscle A muscle that is attached to the bones of the skeleton and provides the force that moves the bones. Striated and Voluntary smooth muscle involuntary muscle found in internal organs Cardic muscle heart muscle, involuntary Striations

Bio 161 QUESTIONS AND ANSWERS A+ GRADED eyeball is located.. in the orbit and connected tothe skull by several external muscles Three layers of the eyeball Outer sclera, Middle choroid, Inner retina Outer sclera Very tough and strong,protective layer• At front of eye, becomes clear cornea Middle choroid Highly vascular Inner retina Location of photoreceptive sensory cells, continuous with optic nerve Conjunctiva a thin, transparent membrane thatcovers eyeball anteriorly an...

BIO161 QUESTIONS AND ANSWERS A+ GRADED Membrane thin layer of tissue that covers a surface, lines a cavity, or divides a space or organ amphipathic having both a hydrophilic region and a hydrophobic region the major types of lipids found in cell membranes are: phospholipids most phospholipids are made up of glycerol backbone attached to a phosphate group and two fatty acids the phosphate head group is hydrophillic The two fatty acid tails are hydrophobic phospholipids behave i...