bio 150 exam 2
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10 Terms
What are the four main functions of the skin?
Protection from the environment, thermoregulation, sensory function, and vitamin D synthesis.
What is the stratum basale?
The deepest layer in the epidermis, most active layer for mitosis.
What is the role of keratinocytes in the skin?
They change shape from cuboidal to squamous, flattening out and losing their nuclei as they progress through layers.
What are the stages of hair growth?
Anagen (growth stage), Catagen (degenerative stage), Telogen (resting stage).
What is eczema?
An allergic reaction of unknown origin that presents as dry, itchy, rash-like patches.
What are the layers involved in a second-degree burn?
The epidermis and part of the dermis.
What are the two types of ossification involved in bone formation?
Endochondral ossification and intramembranous ossification.
What is the primary role of osteoclasts?
Bone resorption.
What type of fracture involves several breaks producing many small pieces?
Comminuted fracture.
What neurotransmitter is responsible for initiating muscle contractions?
Acetylcholine (ACh).
