Christina's fair skin flushes red when she exercises. What is the name of this condition and why does her skin appear red?
What will be an ideal response?
The skin color imparted by hemoglobin may change based on the amount of blood flowing through the dermis. Recall that the dermis is highly vascular while the epidermis is avascular. The skin becomes brighter red when blood flow through the dermis increases, as when the body is trying to release heat during exercise. This color change is called erythema.
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PO2 in the blood
a. refers to the pressure exerted by the amount of oxygen dissolved in the blood. b. is the most important factor determining the percent saturation of hemoglobin. c. is normal in carbon monoxide poisoning. d. two of these answers. e. all of these answers.
The cornea is part of the
A) iris. B) fibrous layer. C) neural layer. D) uvea. E) choroid.
What are the two membranous structures within the muscle fiber that play important roles in linking excitation to contraction?
a. horizontal tubules and sarcoplasmic reticulum b. transverse tubules and sarcoplasmic reticulum c. transverse tubules and endoplasmic reticulum d. horizontal tubules and endoplasmic reticulum e. sarcolemma and plasma end plates
The formation of scar tissue is called __________.
A. regeneration B. necrosis C. neoplasia D. metaplasia E. fibrosis