bio 251 exam 1 WSU question and best rated answers latest 2024

Organs of the body are defined as - Answer- a combination of two or more tissues that make up a structure which performs a specific function What contains most of the water found in the human body? - Answer- intracellular fluid What type of ductless gland secretes hormones into the bloodstream? - Answer- endocrine smallest unit of life - Answer- cells Which tissue conducts signals primarily via electrical impulses? - Answer- nervous tissue Which ion has a greater concentration inside the cell than outside? - Answer- potassium, K+ What organelle synthesizes most of the ATP used by cells? - Answer- mitochondria the biggest component of the plasma membrane, generally consists of two hydrophobic fatty acid "tails" and a hydrophilic "head" consisting of a phosphate group - Answer- phospholipid Process of maintaining the interval environment in a state compatible for life - Answer- homeostasis How many cells are in the human body? - Answer- 100 trillion what are the 4 types of primary tissue? - Answer- epithelial, muscle, nerve, connective What detects change in a regulated variable in negative feedback? - Answer- sensors Where do sensors send information to? - Answer- the integrating center Where do the integrating center relay messages to? - Answer- the effector What type of membrane protein spans the membrane, allowing part of it to face the cytosol and another part to face the extracellular fluid? - Answer- the transmembrane protein What transport mechanism is passive? - Answer- movement of sodium through ion channels What gradient determines the movement of ions across the membrane? - Answer- electrochemical gradient What is primary active transport - Answer- the process in which energy (ATP) is directly used to move against a concentration gradient. What is an example of primary active transport? - Answer- Na+/K+ pump (sodium potassium pump) Molecules always move from... - Answer- high to low concentration in facilitated diffusion, a molecule is moved... - Answer- down its concentration gradient with the assistance of a protein carrier molecule, and no energy is required. What charge does intracellular fluid have? - Answer- negative Extracellular fluid has more... - Answer- anions What transport mechanism requires energy? - Answer- primary and secondary transport In active transport, the affinity of the carrier protein for the molecule being transported is greater on which side of the membrane? - Answer- the side where the molecule is in a lower concentration Intracellular communication that occurs through the binding of a chemical receptor from one cell to the other goes to a specfific... - Answer- receptor