Chapter 3 The Cell (part 2)€¦ · Chapter 3 The Cell (part 2) Golgi complex •Stacked sacs...
Transcript of Chapter 3 The Cell (part 2)€¦ · Chapter 3 The Cell (part 2) Golgi complex •Stacked sacs...
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Chapter 3
The Cell (part 2)
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Golgi complex
• Stacked sacs
• Receive proteins from ER
• Modifies them and packages them up
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Lysosomes
• Contain hydrolytic enzymes that:
– Bkdn old, worn out, or defective parts
– Digest foreign invaders (e.g., bacteria)
engulfed by phagocytosis
– Helps with cell suicide (apoptosis)
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Vesicles Ship and Store
Cellular Products
• Vesicles: membrane-bound spheres
– Used for secretion and storage
– Examples: neurotransmitters,
hormones, lysosomes
Figure 3.18
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Cytoskeleton Supports the Cell
• Microtubules
• Microfilaments
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Mitochondria: Provide Energy
to the Cell• Produce ATP
• Contain chromosomes
(DNA)
• Evolved from
prokaryote (bacteria-
like organism) through
symbiosis
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Our Cells Use Cellular
Respiration to Generate ATP
• Cellular respiration: Cells use glucose
and oxygen to synthesize ATP
• Three stages of respiration
– Glycolysis: in cytoplasm
– Citric Acid Cycle: in mitochondria
– Electron Transport System: in mitochondria
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Overview of Respiration
• C6H12O6 + O2 CO2 + H2O + ATP
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Cellular Respiration
• Glycolysis occurs in the cytoplasm
splitting glucose into two pyruvate
molecules generating a net gain of two
ATP and two NADH molecules
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Cellular Respiration
• The transition reaction occurs within
the mitochondria. CO2 is removed from
each pyruvate forming 2 acetyl CoA
molecules
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Cellular Respiration
• Electrons are removed from Acetyl CoA
in the citric acid cycle releasing two
ATP, two FADH2 and six NADH
molecules
• CO2 is also released in this process
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Cellular Respiration
• The electron transport chain is the
final step where the electrons of FADH2
and NADH are transferred from one
protein to another, until they reach
oxygen
• This process releases energy that
results in 32 ATP
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Cellular Respiration: An
Overview
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Brown Fat
Fat fires up. PET/CT scans of a person exposed to
cold (left) and at room temperature (right) show the
dark signature of brown fat.