Bio 251 Final Exam WITH QUESTION AND WELL VERIFIED ANSWERS 2026!!!
tissues in the body are classified into which of the following four types? - ANSWERS✔️💫-nervous,
muscle, epithelial, and connective
which of the following accurately represents the order of complexity for the body, from least to most
complex? - ANSWERS✔️💫-cells, tissues, organs and organ systems
which of the following compartments contain most of the water found in the human body? -
ANSWERS✔️💫-intracellular fluid
referring to a membrane as "selectively permeable" describes its ability to... - ANSWERS✔️💫-allow the
movement of certain molecules across the membrane but restrict the movement of other molecules
which of the following statements about homeostasis is false? - ANSWERS✔️💫-the primary mechanism
to maintain homeostasis is positive feedback
the body fluid compartment with a high potassium concentration is... - ANSWERS✔️💫-intracellular fluid
extracellular fluid is composed of... - ANSWERS✔️💫-both the interstitial fluid and plasma
direct communication between cells in contact with one another is accomplished through... -
ANSWERS✔️💫-gap junctions
which type of chemical messenger is released into the bloodstream by an endocrine gland where it can
affect target cells throughout the body? - ANSWERS✔️💫-hormone
in most homeostasis mechanisms, a (blank) detects a change in a regulated variable and sends that
information to an (blank) which relays signals to an (blank) usually a muscle or a gland - ANSWERS✔️💫-
sensor; integrating center; effector
ion channels are examples of what type of membrane protein? - ANSWERS✔️💫-transmembrane protein
, which of the following is not a type of integral membrane protein? - ANSWERS✔️💫-an intracellular
receptor for a messenger
when molecules are passively transported across a membrane, the direction of their movement is
dictated by the molecule's tendency to move... - ANSWERS✔️💫-from higher concentration to lower
concentration
based solely upon its negative electrical charge, the inside of a typical cell will tend to attract
extracellular (blank) to move inward - ANSWERS✔️💫-cations
transporting a substance against its concentration gradient requires... - ANSWERS✔️💫-a transporter
that uses metabolic energy
most cells have a resting membrane potential of... - ANSWERS✔️💫--70 mV
what type of ion channels in the membranes of all cells allows ions to constantly move across the
membrane at rest and thereby contribute to the resting membrane potential? - ANSWERS✔️💫-leak
channels
which of the following best describes the electrochemical forces acting on sodium and potassium ions
across the cell membrane? - ANSWERS✔️💫-the force on sodium ions is to move into the cell, and the
force on potassium ions is to move out of the cell
the electrochemical gradient for sodium across the membrane is such that the net flux for sodium
movement is directed (blank), thereby causing the cell's membrane potential to become more (blank) -
ANSWERS✔️💫-inward; positive
in order for a target cell to respond to a chemical messenger, that cell must have a (blank) specific for
that messenger - ANSWERS✔️💫-receptor
which type of chemical messenger, when released, binds to receptors on the same cell that released the
chemical messenger? - ANSWERS✔️💫-autocrine
tissues in the body are classified into which of the following four types? - ANSWERS✔️💫-nervous,
muscle, epithelial, and connective
which of the following accurately represents the order of complexity for the body, from least to most
complex? - ANSWERS✔️💫-cells, tissues, organs and organ systems
which of the following compartments contain most of the water found in the human body? -
ANSWERS✔️💫-intracellular fluid
referring to a membrane as "selectively permeable" describes its ability to... - ANSWERS✔️💫-allow the
movement of certain molecules across the membrane but restrict the movement of other molecules
which of the following statements about homeostasis is false? - ANSWERS✔️💫-the primary mechanism
to maintain homeostasis is positive feedback
the body fluid compartment with a high potassium concentration is... - ANSWERS✔️💫-intracellular fluid
extracellular fluid is composed of... - ANSWERS✔️💫-both the interstitial fluid and plasma
direct communication between cells in contact with one another is accomplished through... -
ANSWERS✔️💫-gap junctions
which type of chemical messenger is released into the bloodstream by an endocrine gland where it can
affect target cells throughout the body? - ANSWERS✔️💫-hormone
in most homeostasis mechanisms, a (blank) detects a change in a regulated variable and sends that
information to an (blank) which relays signals to an (blank) usually a muscle or a gland - ANSWERS✔️💫-
sensor; integrating center; effector
ion channels are examples of what type of membrane protein? - ANSWERS✔️💫-transmembrane protein
, which of the following is not a type of integral membrane protein? - ANSWERS✔️💫-an intracellular
receptor for a messenger
when molecules are passively transported across a membrane, the direction of their movement is
dictated by the molecule's tendency to move... - ANSWERS✔️💫-from higher concentration to lower
concentration
based solely upon its negative electrical charge, the inside of a typical cell will tend to attract
extracellular (blank) to move inward - ANSWERS✔️💫-cations
transporting a substance against its concentration gradient requires... - ANSWERS✔️💫-a transporter
that uses metabolic energy
most cells have a resting membrane potential of... - ANSWERS✔️💫--70 mV
what type of ion channels in the membranes of all cells allows ions to constantly move across the
membrane at rest and thereby contribute to the resting membrane potential? - ANSWERS✔️💫-leak
channels
which of the following best describes the electrochemical forces acting on sodium and potassium ions
across the cell membrane? - ANSWERS✔️💫-the force on sodium ions is to move into the cell, and the
force on potassium ions is to move out of the cell
the electrochemical gradient for sodium across the membrane is such that the net flux for sodium
movement is directed (blank), thereby causing the cell's membrane potential to become more (blank) -
ANSWERS✔️💫-inward; positive
in order for a target cell to respond to a chemical messenger, that cell must have a (blank) specific for
that messenger - ANSWERS✔️💫-receptor
which type of chemical messenger, when released, binds to receptors on the same cell that released the
chemical messenger? - ANSWERS✔️💫-autocrine
