BIO200H5 Lecture Notes - Lecture 4: Glycocalyx, Area Postrema, Neostigmine

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greenjackal905

28 Dec 2014

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Absorption i: the cell and its barriers: introductory, general plan of coming lectures, first big topic: absorption . A: barriers: cellular (today), whole body (next lecture) Review: plasma membrane: membrane composition, membrane structure unstirred h2o glycocalyx phospholipid bilayer with proteins cytoplasm, function of the membrane components phospholipids proteins, action of drugs on the membrane phospholipids proteins. Absorption ii: the body and its barriers: review: body structure. Review: body walls - general occluding zonulae macule junctions. Note: there are two important barriers to drug molecules: the epithelium and the blood-brain barrier. External walls epithelial barrier: skin general (occluding zonulae) Note: includes cornea of eyes, linings of lungs, lining of bladder: gastrointestinal (occluding zonulae) enzyme barriers. Internal walls: cell membranes (divide intra- and extra-cellular space) Q: why is this barrier needed? (not important for drug molecules: capillary walls in general (no barrier) (no barrier for drug molecules, except those bound to plasma proteins)

Related Questions

Chapter 3 discussed cell structure and functions, and chapter 4 discussed the organization and function of the human body. When viewed together, this implies the the functions of the human body are dependent upon cellular activity. Explain why this would be correct. An important cellular structure is the cell (plasma) membrane. Identify and explain a specific function of the cell membrane that you feel is important in achieving homeostasis.

From the following list, select all options that are correctwith respect to the synapse.

Question 5 options:

A)	the synapse is the site where the plasma membrane that coversthe axon terminal of one neuron makes direct contact with and fusesto the plasma membrane on the cell body or dendrite of anotherneuron

B)	the action potential travels through extracellular fluid in thesynapse to get from one neuron to the next

C)	presynaptic nerve terminals release chemical messengers into thesynapse in response to arrival of an action potential

D)	signaling molecules in the synapse can be broken down by enzymesthat are present on the post synaptic cell membrane

E)	signaling molecules in the synapse can bind to 're-uptake'receptors and be taken back into the presynaptic neuron forbreakdown or for repackaging/reuse

F)	signaling molecules can be taken into and degraded within thepostsynaptic cell

G)	signaling molecules in the synapse function as chemicalmessengers that regulate the opening of ligand-gated channels inthe plasma membranes of post synaptic cells

graymink444

1,Match the descriptions to the type of transport.

- A. B. C.	Water enters a cell because it is hypertonic compared to the extracellular environment, increasing its turgor pressure
- A. B. C.	Water enters guard cells because the guard cells are hypertonic compared to the surrounding cells
- A. B. C.	Potassium ions are pumped into guard cells
- A. B. C.	The motor cells of a Venus fly trap are hypotonic compared to surrounding cells, causing water to leave the motor cells
- A. B. C.	Sugar is loaded into the phloem

A.	Both active and passive transport
B.	Passive Transport
C.	Active transport

2,Describe what is wrong with the following statement and explain why:

All prokaryotic and eukaryotic cells contain plasma membrane, nucleus, ribosomes, organelles, cytoplasm, and cell walls.

What is short-distance transport?

	a,	The movement of solutes from a region of low concentration to a region of high concentration
		b,The movement of water, nutrients, and other substances between cells
c,		The movement of substances from a region of high concentration to a region of low concentration
d,		The movement of water across a semipermeable membrane from a region of low solute concentration to a region of high solute concentration.

What terms describe the movement of water across a semipermeable membrane from a region of high water concentration towards a region of low water concentration (and high solute concentration.)

What is found in the proptoplasm?

Cell wall, cytoplasm, plasma membrane, nucleus, and other cell organelles

Plasmodesmata, cell wall, and plasma membrane

Cell wall, cytoplasm, and plasma membrane

Cytoplasm, nucleus, and other cell organelles

The channels that allow nutrients and protoplasm to pass between plant cells are called _________________.

What happens when a plant cell is placed in a hypotonic solution?

Water will enter the plant cell and the plasma membrane will swell and cell lysis will occur

Water will leave the plant cell and the plasma membrane will pull away from the cell and plasmolysis will occur

Water will enter the plant cell and the plasma membrane will swell and push against the cell wall

Water will leave the plant cell and the plant cell will lose turgor pressure, causing the plant to wilt

________________ transport uses cellular energy.

What molecules make plasma cell membranes hydrophilic on the outside and hydrophobic on the inside?

What type of cells do plants have?

		Bacterial
		Archaeic
		Eukaryotic
		Prokaryotic

BIO200H5 Lecture Notes - Lecture 4: Glycocalyx, Area Postrema, Neostigmine

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