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NU 545-Unit 1 QUESTIONS AND ANSWERS 100% CORRECT | LATEST UPDATE 2025
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NU 545-Unit 1 QUESTIONS AND ANSWERS 100% CORRECT | LATEST UPDATE 2025
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NU 545-Unit 1 QUESTIONS AND ANSWERS 100%CORRECT | LATEST UPDATE 2025
Metabolic Absorption - ANSWER One of the eight chief cellular functions - cells
taking in and using nutrients and other substances from their surroundings-
Perixisomes - ANSWER microbodies which are membrane-bound organelles
that contain several oxidative enzymes- Contain enzymes that use oxygen to
remove hydrogen atoms from specific substrates in an oxidative reaction that
produces hydrogen peroxide
Lysosomes - ANSWER released during cell injury and is capable of cellular
autodigestion-- Also where lipids accumulate
Nucleolus - ANSWER small, dense structure composed largely of RNA most of
the cellular DNA and the DNA-binding proteins, the histones, that regulate its
activetu
Nucleus - ANSWER cell division and control of genetic information
Lipids and Proteins - ANSWER the major chemical components of the cell
membrane
Platelet-derived growth factor - ANSWER Stimulates the production of
connective tissue cells and neuroglial cells
, Cell Communication - ANSWER maintains homeostasis and regulates growth,
division, developments and organization into tissues. Also coordinates functions.
It occurs in 3 ways
Chemical Signaling - ANSWER Communication at a distance
Paracrine signaling - ANSWER secrete mediators that are absorbed or
destroyed
Autocrine signaling - ANSWER produce signals that they themselves respond to
Hormonal signaling - ANSWER endocrine cells secrete hormones to produce
response in another set of cells
Neurohormonal signaling - ANSWER hormones released by neurosecretory
neurons
Active Transport - ANSWER Movement of substance across a membrane by
carrier protein that requires expenditure of energy for activation. Only occurs
across living membranes. Receptors must recognize and bind with the substance
to be transported
Cytokines - ANSWER Growth Factors (peptides) that transmit signals within
and between cells. They have a major role in the regulation of tissue growth and
development
Metaplasia - ANSWER reversible replacement of one mature cell by another
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