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Lecture 5

BIOL 1410 Lecture Notes - Lecture 5: Organelle, Chromatin, NucleolusPremium

Biological Sciences
Course Code
BIOL 1410

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BIOL 1410: Anatomy of the Human Body - Lecture 5: The Cellular Level of Organization
Cellular Level of Organization
1) Membranous organelles
a) Mitochondria
the site of ATP synthesis
contains own DNA
contains its RNA and proteins
double membrane
The number of mitochondria in a cell depends on the function of
the cell. For example, a muscle cell will have more mitochondria
b) Endoplasmic reticulum (ER)
membranous network throughout cell
2 types:
i. Rough ER (RER)
ribosomes attached
function: protein synthesis
ii. Smooth ER (SER)
Smooth = no ribosomes attached
continuous with the rough ER
Function: synthesizes lipids, steroid hormones, and
detoxifies drugs
c) Golgi Apparatus/Complex
stacks of membrane discs
modifies, sorts, packages, and delivers proteins/lipids to:
i. cell membrane
ii. lysosomes
iii. for secretion intro bloodstream
d) Lysosomes
contain digestive enzymes
i. digest bacteria
ii. digest worn-out organelles
iii. digest the cell itself (programmed cell death)
2) Nucleus
largest membranous organelle
control center of the cell
Can be:
1. Uninucleate (one nucleus only per cell)
2. Multinucleate
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