Anatomy & Physiology B/C

[bernard]

Describe each of the layers present in thick skin.

[GoofyFoofer]

from inside to out (Click to Show Hidden Text)

Stratum: Basale, Spinosum, Granulosum, Lucidum (only present in thick skin), and Corneum

[bernard]

from inside to out (Click to Show Hidden Text)

Stratum: Basale, Spinosum, Granulosum, Lucidum (only present in thick skin), and Corneum

Keep going! Notice I said "describe" rather than "list" ;)

[GoofyFoofer]

from inside to out (Click to Show Hidden Text)

Stratum: Basale, Spinosum, Granulosum, Lucidum (only present in thick skin), and Corneum

Keep going! Notice I said "describe" rather than "list"

Oh, sorry.

answer (revised) (Click to Show Hidden Text)

stratum basale: typically 1-3 cells thick, layer where skin cells grow and divide; also contains melanocytes, Langerhans cells, and Merkel cells
stratum spinosum: composed of layers of polygonal cells that have a spiny appearance (hence its name)
stratum granulosum: thin layer of skin where cells lose their their nuclei and gain hydrophobic qualities
stratum lucidum: thin, clear, layer of dead cells that have flattened, only present in thick skin 
stratum corneum: 15-20 layers of dead cells w/out nuclei nor organelles, serves to protect underlying tissues from              chemicals, dehydration, infection, etc.

[bernard]

from inside to out (Click to Show Hidden Text)

Stratum: Basale, Spinosum, Granulosum, Lucidum (only present in thick skin), and Corneum

Keep going! Notice I said "describe" rather than "list" ;)

Oh, sorry.

answer (revised) (Click to Show Hidden Text)

stratum basale: typically 1-3 cells thick, layer where skin cells grow and divide; also contains melanocytes, Langerhans cells, and Merkel cells
stratum spinosum: composed of layers of polygonal cells that have a spiny appearance (hence its name)
stratum granulosum: thin layer of skin where cells lose their their nuclei and gain hydrophobic qualities
stratum lucidum: thin, clear, layer of dead cells that have flattened, only present in thick skin 
stratum corneum: 15-20 layers of dead cells w/out nuclei nor organelles, serves to protect underlying tissues from              chemicals, dehydration, infection, etc.

Very good; you had all the key things I was looking for! Your turn!

[GoofyFoofer]

Alright.
Describe the path a signal takes through the electrical system of the heart.

[Eggo]

The signal travels as follows: SA Node-->AV Node-->AV Bundle(Bundle of His)--> Left and Right Bundle Branches-->Purkinje Fibers

[GoofyFoofer]

Correct, Eggo!
Your turn!

[Eggo]

When an individual is exercising after eating a meal, what role will his pre-capillary sphincters play in giving him cramps?

[pandora_9999]

When an individual is exercising after eating a meal, what role will his pre-capillary sphincters play in giving him cramps?

Alright.. (Click to Show Hidden Text)

Pre-cappillary sphincters are bands of smooth muscle that can control the blood flow to a certain area. When one exercises after eating a meal, blood flow to the digestive system decreases to allow more blood flow to the muscles under stress therefore causing cramps in the gut.