3 Active Transport - Weeblychssciencedavis.weebly.com/.../3_active_transport.pdfActive Transport...
Transcript of 3 Active Transport - Weeblychssciencedavis.weebly.com/.../3_active_transport.pdfActive Transport...
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Active Transport & Homeostasis
Life Science: Molecular
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Membrane ProteinsTransporters are transmembrane proteins that use energy to move molecules across a membrane.
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Active TransportLow Concentration
Cell Membrane
High Concentration
Low Concentration
Cell Membrane
High Concentration
Active transport is the movement of molecules through a membrane against a concentration difference.
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Protein pumps use energy to move molecules such as calcium, potassium, and sodium ions across the membrane against a concentration gradient. – sodium-potassium pump
• pumps sodium out • pumps potassium in
Transmembrane Pumps
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Active Transport
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Active TransportLarger molecules can be transported by movements of the cell membrane known as bulk transport. – Endocytosis is the process of taking material into the
cell by infolding of the cell membrane. • phagocytosis - cell eating • pinocytosis - cell drinking
– Exocytosis is a process of releasing large amounts of materials from the cell.
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Active Transport
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Homeostasis• Homeostasis means maintaining a constant
internal environment. • Cells need to maintain a narrow range of
conditions to stay alive. – temperature – pH – salinity – minerals – glucose
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Hypothalamus• Hypothalamus = master nerve control center
➡ receives information about internal conditions from nervous system
➡ releases hormones to maintain homeostasis
• Pituitary gland = master endocrine gland ➡ secretes broad range of hormones
to regulate other glandsin the body hypothalamus
pituitary
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Chemical Controls➡ Neurotransmitters released by neurons ➡ Hormones released by endocrine glands
axon
endocrine gland
receptor proteins
target cell
receptor proteins
hormone carried by blood
neurotransmitter
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Feedback• There are two ways to maintain homeostasis
– Positive feedback – Negative feedback
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Maintaining Homeostasis
high
low
hormone 1
lowersbody condition
hormone 2
gland
specific body condition
raisesbody condition gland
Negative FeedbackModel
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Blood Osmolarity
Osmoregulation
osmoreceptors inhypothalamus
nephron
nephron
ADH
promoteswaterreabsorption
increase thirst
renin
promotessodiumreabsorption
high salt
pituitary
angiotensin
adrenalgland
aldosterone
nephron (JGA)
low blood pressureJuxtaGlomerular Apparatus