Bio 3421 Exam 1 Study Questions and Correct Answers

Characteristics of living things -Be able to reproduce -Have cells -Be able to respond to stimuli -Obtain energy -Evolve -Homeostasis What is physiology? The study of the processes or functions of organisms and how living things work Basics on levels of organization Molecules-- cells-- tissues -- organs -- systems--organisms Homeostasis Living things maintain this, process by which an organism maintains equilibrium or internal consistency Negative feedback -Main regulatory mechanism for homeostasis -Occurs when a change in a variable triggers a response that opposes the change -Minor change causes correction Ex-Blood pressure gets too high, this brings it back to normal Feedforward control Anticipation, not outside normal yet... but thinks it will become abnormal Ex-Smelling food, digestive system is activated Biology Scientific study of living things Positive feedback Signaling needed less, less common, continues to move in the direction of change, occurs when rapid change is needed Ex-Birth of a mammal, fetus puts pressure on uterus & makes oxytocin, which increases contractions Molecules Assemble into cell structures, regulate cell functions, & catalyze cell rxns Tissue Group of cells with similar structures and functions. 4 main types: epithelial, connective, muscular and nervous Organ 2 or more types of tissue organized to perform a particular function