Slides - gserianne.com
... • diffusion across a membrane with the help of a channel or carrier molecule • e.g, transport of glucose across cell membrane BUT…still from a region of higher concentration to a region of lower concentration Figure from: Hole’s Human A&P, 12th edition, 2010 ...
... • diffusion across a membrane with the help of a channel or carrier molecule • e.g, transport of glucose across cell membrane BUT…still from a region of higher concentration to a region of lower concentration Figure from: Hole’s Human A&P, 12th edition, 2010 ...
Cell membranes
... What are membranes? Membranes cover the surface of every cell, and also surround most organelles within cells. They have a number of functions, such as: keeping all cellular components inside the cell allowing selected molecules to move in and out of the cell isolating organelles from the res ...
... What are membranes? Membranes cover the surface of every cell, and also surround most organelles within cells. They have a number of functions, such as: keeping all cellular components inside the cell allowing selected molecules to move in and out of the cell isolating organelles from the res ...
Divisions of the Nervous System
... Consists of the spinal cord and brain Contains neural tissue, connective tissues, and blood vessels Functions of the CNS Are to process and coordinate: – sensory data: from inside and outside body – motor commands: control activities of peripheral organs (e.g., skeletal muscles) – higher fun ...
... Consists of the spinal cord and brain Contains neural tissue, connective tissues, and blood vessels Functions of the CNS Are to process and coordinate: – sensory data: from inside and outside body – motor commands: control activities of peripheral organs (e.g., skeletal muscles) – higher fun ...
Inhibitory postsynaptic potential
... – Excitatory postsynaptic potential (EPSP) – produces a small local depolarization, pushing the cell closer to threshold – Inhibitory postsynaptic potential (IPSP) – produces a small hyperpolarization, pushing the cell further away from threshold ...
... – Excitatory postsynaptic potential (EPSP) – produces a small local depolarization, pushing the cell closer to threshold – Inhibitory postsynaptic potential (IPSP) – produces a small hyperpolarization, pushing the cell further away from threshold ...
Chapter 10
... 7. Explain how neurons are classified on the basis of their function. Nerve fibers can be classified into three groups: Sensory—Sensory (afferent) neurons sense changes inside or outside the body by means of receptors ends or nearby receptor cells. They send impulses to the CNS in response to these ...
... 7. Explain how neurons are classified on the basis of their function. Nerve fibers can be classified into three groups: Sensory—Sensory (afferent) neurons sense changes inside or outside the body by means of receptors ends or nearby receptor cells. They send impulses to the CNS in response to these ...
Slide 1
... Ex. Smells: the garbage begins to smell in one spot, but the smell slowly expands throughout the house The smell gets lighter and lighter as it expands throughout the house It tries to spread out as evenly as possible ...
... Ex. Smells: the garbage begins to smell in one spot, but the smell slowly expands throughout the house The smell gets lighter and lighter as it expands throughout the house It tries to spread out as evenly as possible ...
Review Chapter 5
... Explain the types of passive transport. Diffusion: movement of molecules from an area of higher conc. to an area of lower concentration Example: Food coloring added to water (S.A) Osmosis: movement of water from an area of higher concentration to an area of lower concentration (S.A) Facilitated Diff ...
... Explain the types of passive transport. Diffusion: movement of molecules from an area of higher conc. to an area of lower concentration Example: Food coloring added to water (S.A) Osmosis: movement of water from an area of higher concentration to an area of lower concentration (S.A) Facilitated Diff ...
HONORS BIO TRANSPORT TEST NAME (2 points each) MULTIPLE
... C. isotonic _________ When a plant cell is placed in a HYPERTONIC solution, _____________________. A. plasmolysis will happen B. cytolysis will happen C. osmotic pressure will increase D. nothing will happen. The cell will stay the same size _________ An animal cell placed in a _______________ solut ...
... C. isotonic _________ When a plant cell is placed in a HYPERTONIC solution, _____________________. A. plasmolysis will happen B. cytolysis will happen C. osmotic pressure will increase D. nothing will happen. The cell will stay the same size _________ An animal cell placed in a _______________ solut ...
Cell Membrane and Transport
... Molecules and ions are in constant motion. In gases and liquides they move freely. As a result of their random motion, each type of molecule or ion tends to spread out evenly within thespace available. This is diffusion. Diffusion results in the net movement of ions and molecules from a high concent ...
... Molecules and ions are in constant motion. In gases and liquides they move freely. As a result of their random motion, each type of molecule or ion tends to spread out evenly within thespace available. This is diffusion. Diffusion results in the net movement of ions and molecules from a high concent ...
Cells - Junctions and Transport
... Special Membrane Junctions • Gap Junction – “bond” or nexus – Communicating junction between adjacent cells – Cells are connected by hollow cylinders called connexons. – Small molecules pass through the water filled channels from one cell to the next. – Present in electrically excitable tissues lik ...
... Special Membrane Junctions • Gap Junction – “bond” or nexus – Communicating junction between adjacent cells – Cells are connected by hollow cylinders called connexons. – Small molecules pass through the water filled channels from one cell to the next. – Present in electrically excitable tissues lik ...
Cell Processes
... • Particles of a solution continue to move across the membrane even when equilibrium is reached, there is just no further change in concentration ...
... • Particles of a solution continue to move across the membrane even when equilibrium is reached, there is just no further change in concentration ...
Celltransport3
... • Hydrostatic pressure - the force exerted on the membrane by water • In capillaries, blood pressure forces water, salts, nutrients and solutes into tissue fluid, while larger particles like blood cells and protein are held back ...
... • Hydrostatic pressure - the force exerted on the membrane by water • In capillaries, blood pressure forces water, salts, nutrients and solutes into tissue fluid, while larger particles like blood cells and protein are held back ...
Chapter 11 Selected Solutions
... molecules. The answer in the text says 63, but that was gotten by dividing by monomer MW of 288, which is wrong because the sodium is not covalently attached to the DS (dodecyl-sulfate). 5. Length of a fatty acid molecule: there is a bit of trigonometry here. We will do this in class. The textbook a ...
... molecules. The answer in the text says 63, but that was gotten by dividing by monomer MW of 288, which is wrong because the sodium is not covalently attached to the DS (dodecyl-sulfate). 5. Length of a fatty acid molecule: there is a bit of trigonometry here. We will do this in class. The textbook a ...
bioii ch10 ppt
... relative to the outside • polarized membrane • due to distribution of ions • Na+/K+ pump ...
... relative to the outside • polarized membrane • due to distribution of ions • Na+/K+ pump ...
With Light
... – Activate effector molecules (kinases) which modulate many targets (ion channels, other enzymes) – Identify specifics of cited examples ...
... – Activate effector molecules (kinases) which modulate many targets (ion channels, other enzymes) – Identify specifics of cited examples ...
File: Chap03, Chapter 3: Structure and Function of the Cell
... only gases and water can pass through it. substances need permission to pass through it. only certain substances can pass through it. substances need carrier molecules to pass through it. ATP is always needed to move molecules across the plasma membrane. ...
... only gases and water can pass through it. substances need permission to pass through it. only certain substances can pass through it. substances need carrier molecules to pass through it. ATP is always needed to move molecules across the plasma membrane. ...
Neuron, Impulse Generation, and Reflex Arc
... - There is unequal distribution of Na+ ions and K+ ions on either side of the membrane because of a sodium-potassium pump or Na+/K+ ATPase. This pump ejects 3 Na+ ions from the neuron for every 2 K+ it brings in. The inside of the cell is negative compared to the outside. - In addition, there is a h ...
... - There is unequal distribution of Na+ ions and K+ ions on either side of the membrane because of a sodium-potassium pump or Na+/K+ ATPase. This pump ejects 3 Na+ ions from the neuron for every 2 K+ it brings in. The inside of the cell is negative compared to the outside. - In addition, there is a h ...
The Cell Membrane is a Fluid Mosaic
... glycocalyx, your body can recognize cells and determine if they should be there or not. They glycocalyx can also act as a glue to attach cells together. ...
... glycocalyx, your body can recognize cells and determine if they should be there or not. They glycocalyx can also act as a glue to attach cells together. ...
Cellular Transport WebQuest
... 4. Animal cell membranes contain _______________linking the fatty acids together and so stabilizing and strengthening the membrane. 1. Proteins ______________ proteins usually span from one side of the phospholipid bilayer to the other (integral proteins) 2. ______________ proteins sit on one the su ...
... 4. Animal cell membranes contain _______________linking the fatty acids together and so stabilizing and strengthening the membrane. 1. Proteins ______________ proteins usually span from one side of the phospholipid bilayer to the other (integral proteins) 2. ______________ proteins sit on one the su ...
Cellular Transport WebQuest
... 4. Animal cell membranes contain _______________linking the fatty acids together and so stabilizing and strengthening the membrane. 1. Proteins ______________ proteins usually span from one side of the phospholipid bilayer to the other (integral proteins) 2. ______________ proteins sit on one the su ...
... 4. Animal cell membranes contain _______________linking the fatty acids together and so stabilizing and strengthening the membrane. 1. Proteins ______________ proteins usually span from one side of the phospholipid bilayer to the other (integral proteins) 2. ______________ proteins sit on one the su ...
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.