Transport Group work
... and closer to explaining how that phenomenon actually works in nature. Models can then be used to predict how your system might respond if you perturbed it in some specific way. So far in our story… A prokaryotic cell grows by binary fission in order to colonize or infect a host. To do this it needs ...
... and closer to explaining how that phenomenon actually works in nature. Models can then be used to predict how your system might respond if you perturbed it in some specific way. So far in our story… A prokaryotic cell grows by binary fission in order to colonize or infect a host. To do this it needs ...
Nervous tissue
... • Na+ rushes in down concentration and electrical gradients • Na+ diffuses for short distance inside membrane producing a change in voltage called a local potential ...
... • Na+ rushes in down concentration and electrical gradients • Na+ diffuses for short distance inside membrane producing a change in voltage called a local potential ...
Cell Transport - Elmwood Park Memorial High School
... • Either not soluble in lipids or too large. • Movement assisted by carrier proteins. ...
... • Either not soluble in lipids or too large. • Movement assisted by carrier proteins. ...
Osmosis Diffusion Notes
... Cell Membarane • Also known as Plasma Membrane and Phospholipid Bi-layer • Defines the shape of the cell. • Maintains Homeostasis (controls what goes in and out) ...
... Cell Membarane • Also known as Plasma Membrane and Phospholipid Bi-layer • Defines the shape of the cell. • Maintains Homeostasis (controls what goes in and out) ...
Cell Boundaries
... Isotonic – Concentration of solutes outside and inside cell are equal. – water moves in and out at the same rate ...
... Isotonic – Concentration of solutes outside and inside cell are equal. – water moves in and out at the same rate ...
Section: 2.6 Name:
... Diffusion -‐ the movement of molecules from high concentration to low concentration Diffusion through the Cell Membrane (Selectively Permeable) Cologne diffusing through a ...
... Diffusion -‐ the movement of molecules from high concentration to low concentration Diffusion through the Cell Membrane (Selectively Permeable) Cologne diffusing through a ...
The Cell Membrane Selectively Permeable Membrane
... Phospholipids have the ability to move laterally but only upon a rare occasion are able to make a 180o turn. ...
... Phospholipids have the ability to move laterally but only upon a rare occasion are able to make a 180o turn. ...
1.16 Answers
... 1. (a) Similarity: Active transport and facilitated diffusion use transmembrane protein carriers to move materials across a selectively permeable membrane. Differences: 1. Active transport uses ATP; facilitated diffusion does not. 2. Facilitated diffusion carries solutes down a concentration gradien ...
... 1. (a) Similarity: Active transport and facilitated diffusion use transmembrane protein carriers to move materials across a selectively permeable membrane. Differences: 1. Active transport uses ATP; facilitated diffusion does not. 2. Facilitated diffusion carries solutes down a concentration gradien ...
Psych 9A. Lec. 05 PP Slides: Brain and Nervous System
... Communication Among Neurons • Resting potential: • When the membrane is stable, an excess of positively charged ions is on the outside, resulting in a negative voltage difference across the membrane. • When the membrane is stimulated, ion channels open: • leading to an action potential. • Ion movem ...
... Communication Among Neurons • Resting potential: • When the membrane is stable, an excess of positively charged ions is on the outside, resulting in a negative voltage difference across the membrane. • When the membrane is stimulated, ion channels open: • leading to an action potential. • Ion movem ...
membrane structure and function
... • May be specific • May be saturated or inhibited • Protein assists the process of diffusion; passive ...
... • May be specific • May be saturated or inhibited • Protein assists the process of diffusion; passive ...
Active Transport
... • Molecules move UP the concentration gradient • Molecules move from an area of lower concentration to an area of higher concentration • Requires energy (ATP) ...
... • Molecules move UP the concentration gradient • Molecules move from an area of lower concentration to an area of higher concentration • Requires energy (ATP) ...
Chapter 5: Homeostasis and Transport
... proteins, and carrier proteins are three types of transport proteins that are involved in facilitated diffusion. Active transport requires energy from the cell. It occurs when substances move from areas of lower to higher concentration; against the concentration gradient, or when very large molecule ...
... proteins, and carrier proteins are three types of transport proteins that are involved in facilitated diffusion. Active transport requires energy from the cell. It occurs when substances move from areas of lower to higher concentration; against the concentration gradient, or when very large molecule ...
Nervous System webquest……
... axon. What is happening to the charge on the outside and inside of the cell as the action potential moves? ...
... axon. What is happening to the charge on the outside and inside of the cell as the action potential moves? ...
Cell Membrane
... The cell membrane is a fluid, semi-permeable bilayer that separates the cell's contents from the environment. Cell membrane ...
... The cell membrane is a fluid, semi-permeable bilayer that separates the cell's contents from the environment. Cell membrane ...
Chapter 48 and 49 Name_______________________________
... 9. What change in the permeability of the cell’s membrane to K+ and/or Na+ could cause the cell’s membrane potential to shift from -70mV to -90mV? The opening of ion channels in the plasma membrane converts chemical potential to electrical potential A neuron at resting potential contains many open K ...
... 9. What change in the permeability of the cell’s membrane to K+ and/or Na+ could cause the cell’s membrane potential to shift from -70mV to -90mV? The opening of ion channels in the plasma membrane converts chemical potential to electrical potential A neuron at resting potential contains many open K ...
Membrane Asymmetry and Surface Potential
... erythrocyte, the outer surface lipids are neutral except for the glycolipids and in that case the charges are separated from the membrane surface by the length of the carbohydrate molecules. At the cytoplasmic surface, we find over 90% of the phosphatidyl serine and inositol which constitute 12-20% ...
... erythrocyte, the outer surface lipids are neutral except for the glycolipids and in that case the charges are separated from the membrane surface by the length of the carbohydrate molecules. At the cytoplasmic surface, we find over 90% of the phosphatidyl serine and inositol which constitute 12-20% ...
Ch 09 Nervous System
... 1. Neuron membrane maintains resting potential 2. Threshold stimulus is received 3. Sodium channels open 4. Sodium ions diffuse inward, depolarizing the membrane 5. Potassium channels open 6. Potassium ions diffuse outward, repolarizing the membrane 7. The resulting action potential causes a local ...
... 1. Neuron membrane maintains resting potential 2. Threshold stimulus is received 3. Sodium channels open 4. Sodium ions diffuse inward, depolarizing the membrane 5. Potassium channels open 6. Potassium ions diffuse outward, repolarizing the membrane 7. The resulting action potential causes a local ...
No Slide Title
... • When an action potential reaches the terminal buttons they secrete a transmitter substance which travels across the synapse to the next neuron in the chain. • The neurotransmitter either excites or inhibits the postsynaptic receptors (dendrites) of another neuron. • Thus an individual neuron recei ...
... • When an action potential reaches the terminal buttons they secrete a transmitter substance which travels across the synapse to the next neuron in the chain. • The neurotransmitter either excites or inhibits the postsynaptic receptors (dendrites) of another neuron. • Thus an individual neuron recei ...
Active Transport
... To move substances against a concentration or an electrochemical gradient, the cell must use energy. This energy is harvested from ATP that is generated through cellular metabolism. Active transport mechanisms, collectively called pumps or carrier proteins, work against electrochemical gradients. Wi ...
... To move substances against a concentration or an electrochemical gradient, the cell must use energy. This energy is harvested from ATP that is generated through cellular metabolism. Active transport mechanisms, collectively called pumps or carrier proteins, work against electrochemical gradients. Wi ...
Membrane potential
Membrane potential (also transmembrane potential or membrane voltage) is the difference in electric potential between the interior and the exterior of a biological cell. With respect to the exterior of the cell, typical values of membrane potential range from –40 mV to –80 mV.All animal cells are surrounded by a membrane composed of a lipid bilayer with proteins embedded in it. The membrane serves as both an insulator and a diffusion barrier to the movement of ions. Ion transporter/pump proteins actively push ions across the membrane and establish concentration gradients across the membrane, and ion channels allow ions to move across the membrane down those concentration gradients. Ion pumps and ion channels are electrically equivalent to a set of batteries and resistors inserted in the membrane, and therefore create a voltage difference between the two sides of the membrane.Virtually all eukaryotic cells (including cells from animals, plants, and fungi) maintain a non-zero transmembrane potential, usually with a negative voltage in the cell interior as compared to the cell exterior ranging from –40 mV to –80 mV. The membrane potential has two basic functions. First, it allows a cell to function as a battery, providing power to operate a variety of ""molecular devices"" embedded in the membrane. Second, in electrically excitable cells such as neurons and muscle cells, it is used for transmitting signals between different parts of a cell. Signals are generated by opening or closing of ion channels at one point in the membrane, producing a local change in the membrane potential. This change in the electric field can be quickly affected by either adjacent or more distant ion channels in the membrane. Those ion channels can then open or close as a result of the potential change, reproducing the signal.In non-excitable cells, and in excitable cells in their baseline states, the membrane potential is held at a relatively stable value, called the resting potential. For neurons, typical values of the resting potential range from –70 to –80 millivolts; that is, the interior of a cell has a negative baseline voltage of a bit less than one-tenth of a volt. The opening and closing of ion channels can induce a departure from the resting potential. This is called a depolarization if the interior voltage becomes less negative (say from –70 mV to –60 mV), or a hyperpolarization if the interior voltage becomes more negative (say from –70 mV to –80 mV). In excitable cells, a sufficiently large depolarization can evoke an action potential, in which the membrane potential changes rapidly and significantly for a short time (on the order of 1 to 100 milliseconds), often reversing its polarity. Action potentials are generated by the activation of certain voltage-gated ion channels.In neurons, the factors that influence the membrane potential are diverse. They include numerous types of ion channels, some of which are chemically gated and some of which are voltage-gated. Because voltage-gated ion channels are controlled by the membrane potential, while the membrane potential itself is influenced by these same ion channels, feedback loops that allow for complex temporal dynamics arise, including oscillations and regenerative events such as action potentials.