Exam (elaborations)

BIOS 255 COMPREHENSIVE EXAM QUESTIONS AND ANSWERS

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BIOS 255 COMPREHENSIVE

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Uploaded on November 12, 2024
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Written in 2024/2025
Type Exam (elaborations)
Contains Questions & answers

what is homeostasis
superior
proximal
bios 255 comprehensive exam
what are the components of a homeostatic mechanism
what is a negative feedback mechanism
what is a positive feedback mechanism

Institution BIOS 255 COMPREHENSIVE
Course BIOS 255 COMPREHENSIVE

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BIOS 255 COMPREHENSIVE EXAM
What is homeostasis? - Answer- maintenance of a stable internal environment with
the contribution of all organ systems

What are the components of a homeostatic mechanism? - Answer- -Stimulus
-Receptors
-Control center
-Effector
-Response

What is a negative feedback mechanism? - 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? - Answer- Amplifies the change from the
normal level. (Agrees with the change)
Example: Childbirth, blood clotting

What feedback mechanism is most common? - Answer- negative

Inferior - Answer- Below; at a lower level

Superior - Answer- Above; higher level

Lateral - Answer- Side; Away from the midline of the body

Proximal - Answer- Closer to the point of attachment

Distal - Answer- Father away from the point of attachment

Medial - Answer- Toward the midline of the body

Sagittal - Answer- divides body into left and right

Transverse - Answer- Divides body into upper and lower parts

Anterior - Answer- toward the front of the body

Posterior - Answer- toward the back of the body

Frontal plane - Answer- Divides the body into anterior (front) and posterior (back)
portions.

Which part of the atom is involved in chemical reactions? - Answer- Electrons

Which part of the atom makes up the atomic number? - Answer- Protons

, pH scale - 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? - Answer- Protein
synthesis

What kind of cell division results in a diploid, increasing the number of cells? -
Answer- Mitosis

How many pairs of chromosomes do humans have? - Answer- 23 pairs

What kind of cell division results in a haploid? - Answer- Meiosis

Meiosis I - Answer- Splits genetic material in half, producing a diploid

Meiosis II - Answer- Separates sister chromatids
-four haploid daughter cells
-develop into egg or sperm

Prophase - Answer- Chromosomes become visible, nuclear envelope dissolves,
spindle forms

Metaphase - Answer- Chromosomes line up in the middle of the cell

Anaphase - Answer- Chromosomes separate and move to opposite ends of the cell

Telophase - Answer- Chromosomes move to opposite ends of the cell and two nuclei
are formed.

What are the 4 types of tissues? - Answer- epithelial, connective, muscle, nervous

What are the properties of epithelial tissue? - 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? - Answer- Cell regeneration is triggered.

Where can simple squamous epithelium be found? - Answer- heart, blood vessels,
kidneys, lungs

Where can you find transitional epithelium? - Answer- urinary bladder

Where can columnar epithelium be found? - Answer- passages of the respiratory
system

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Exam (elaborations)

BIOS 255 COMPREHENSIVE EXAM QUESTIONS AND ANSWERS

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