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BIOS 255 Comprehensive Exam with correct answers
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BIOS 255 Comprehensive Exam withcorrect answers
What is homeostasis? - correct answer -maintenance of a stable internal environment with the
contribution of all organ systems
What are the components of a homeostatic mechanism? - correct answer --Stimulus
-Receptors
-Control center
-Effector
-Response
What is a negative feedback mechanism? - correct answer -Body REVERSES, or goes against, an original
stimulus to return to homeostasis
Example: Blood glucose regulation after eating.
What is a positive feedback mechanism? - correct answer -Amplifies the change from the normal level.
(Agrees with the change)
Example: Childbirth, blood clotting
What feedback mechanism is most common? - correct answer -negative
Inferior - correct answer -Below; at a lower level
Superior - correct answer -Above; higher level
Lateral - correct answer -Side; Away from the midline of the body
Proximal - correct answer -Closer to the point of attachment
,Distal - correct answer -Father away from the point of attachment
Medial - correct answer -Toward the midline of the body
Sagittal - correct answer -divides body into left and right
Transverse - correct answer -Divides body into upper and lower parts
Anterior - correct answer -toward the front of the body
Posterior - correct answer -toward the back of the body
Frontal plane - correct answer -Divides the body into anterior (front) and posterior (back) portions.
Which part of the atom is involved in chemical reactions? - correct answer -Electrons
Which part of the atom makes up the atomic number? - correct answer -Protons
pH scale - correct answer -Measurement of hydrogen ion concentration
- pH < 7: Acidic
-pH > 7: Alkaline (basic)
-pH = 7: neutral
What is the main function on rough endoplasmic reticulum? - correct answer -Protein synthesis
What kind of cell division results in a diploid, increasing the number of cells? - correct answer -Mitosis
How many pairs of chromosomes do humans have? - correct answer -23 pairs
, What kind of cell division results in a haploid? - correct answer -Meiosis
Meiosis I - correct answer -Splits genetic material in half, producing a diploid
Meiosis II - correct answer -Separates sister chromatids
-four haploid daughter cells
-develop into egg or sperm
Prophase - correct answer -Chromosomes become visible, nuclear envelope dissolves, spindle forms
Metaphase - correct answer -Chromosomes line up in the middle of the cell
Anaphase - correct answer -Chromosomes separate and move to opposite ends of the cell
Telophase - correct answer -Chromosomes move to opposite ends of the cell and two nuclei are formed.
What are the 4 types of tissues? - correct answer -epithelial, connective, muscle, nervous
What are the properties of epithelial tissue? - correct answer --Cells sit on basement membrane
-Has apical surface and basal surface
-Avascular
-Polarity
-Innervated
What occurs when the apical surface of epithelial cells separate from the basement layer? - correct
answer -Cell regeneration is triggered.
Where can simple squamous epithelium be found? - correct answer -heart, blood vessels, kidneys, lungs
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