BPK 105: MODULE 1 REVIEW QUESTIONS WITH
VERIFIED ACCURATE ANSWERS
Define the term "organ system." Describe three of the eleven organ systems in the body
by describing their main function and the organs that they consist of. - Answers - Organ
system: a group of organs classified as a unit because of a common function or set of
functions.
1. Urinary system: remove liquid waste - urethra, urinary bladder, kidneys
2. Digestive system: digest food - stomach, pancreas, liver
3. Lymphatic system: collect/transport tissue fluid - lymph nodes, spleen, thymus
Describe the concept of homeostasis. Why is it important? What type of feedback is
utilized to maintain homeostasis? - Answers - Homeostasis is the maintenance of a
relatively constant body environment despite changes in the external/internal
environment. It is important because cells are dependent on the small amount of
surrounding fluid to stay within a narrow range of variability. Negative-feedback
mechanisms help maintain homeostasis by maintaining variations within a normal
range.
Define negative feedback and positive feedback. Describe an example of each to clarify
the meaning of these physiological concepts. - Answers - Negative feedback: Any
deviation from the set-point is resisted. Keeps variations within a normal range. (Eg.
Blood pressure.)
Positive feedback: Any deviation from the set-point increases. Used to re-achieve
homeostasis. (Eg. clot formation during blood loss - a chemical responsible for clotting
stimulates production of itself.)
The human body consists of many different types of elements. Interactions among
these elements allow the formation of ions and molecules that are essential for the
physiological function of the human body. Describe the terms "ion" and "molecule" and
provide two examples of each. - Answers - Ion: When an atom's balance of protons and
electrons become unequal (through either the loss or gain of electrons), an ion is
formed. Two examples include calcium and iron.
Molecule: The chemical combination of two or more atoms to create an independently
acting structure. Two examples include polar molecules and nonpolar molecules.
Describe the three classifications of chemical reactions. Include a specific example of
each type. - Answers - Synthesis - when two or more reactants combine to form a
larger/more complex product. (Eg. synthesis of ADP and a phosphate to form ATP)
Decomposition - reactants are broken down into smaller/less complex products. (Eg.
breakdown of ATP to ADP and a phosphate)
VERIFIED ACCURATE ANSWERS
Define the term "organ system." Describe three of the eleven organ systems in the body
by describing their main function and the organs that they consist of. - Answers - Organ
system: a group of organs classified as a unit because of a common function or set of
functions.
1. Urinary system: remove liquid waste - urethra, urinary bladder, kidneys
2. Digestive system: digest food - stomach, pancreas, liver
3. Lymphatic system: collect/transport tissue fluid - lymph nodes, spleen, thymus
Describe the concept of homeostasis. Why is it important? What type of feedback is
utilized to maintain homeostasis? - Answers - Homeostasis is the maintenance of a
relatively constant body environment despite changes in the external/internal
environment. It is important because cells are dependent on the small amount of
surrounding fluid to stay within a narrow range of variability. Negative-feedback
mechanisms help maintain homeostasis by maintaining variations within a normal
range.
Define negative feedback and positive feedback. Describe an example of each to clarify
the meaning of these physiological concepts. - Answers - Negative feedback: Any
deviation from the set-point is resisted. Keeps variations within a normal range. (Eg.
Blood pressure.)
Positive feedback: Any deviation from the set-point increases. Used to re-achieve
homeostasis. (Eg. clot formation during blood loss - a chemical responsible for clotting
stimulates production of itself.)
The human body consists of many different types of elements. Interactions among
these elements allow the formation of ions and molecules that are essential for the
physiological function of the human body. Describe the terms "ion" and "molecule" and
provide two examples of each. - Answers - Ion: When an atom's balance of protons and
electrons become unequal (through either the loss or gain of electrons), an ion is
formed. Two examples include calcium and iron.
Molecule: The chemical combination of two or more atoms to create an independently
acting structure. Two examples include polar molecules and nonpolar molecules.
Describe the three classifications of chemical reactions. Include a specific example of
each type. - Answers - Synthesis - when two or more reactants combine to form a
larger/more complex product. (Eg. synthesis of ADP and a phosphate to form ATP)
Decomposition - reactants are broken down into smaller/less complex products. (Eg.
breakdown of ATP to ADP and a phosphate)
