Answer:
Todos los tejidos epiteliales tienen estas características comunes:
Forman láminas de células fuertemente unidas o se enrollan en tubos. Las células epiteliales se encuentran en la membrana basal. Las células epiteliales tienen dos "lados" diferentes: apical y basolateral. El lado apical siempre mira hacia afuera del cuerpo (hacia afuera o hacia un lumen).
Explanation:
Answer: Refractory period of the cardiac action potential
Explanation:
Unlike the skeletal muscle which can be reactivated before it reaches a contraction, cardiac muscle must wait before it is almost completely relaxed to be activated again (because of its long refractory period), so one cannot make an increase in strength of contraction with a high frequency of stimulations.
Answer:
The heart is a cone-shaped muscular organ located within the THORAX
. Its apex rests on the DIAPHRAGM , and its base is at the level
of the SECOND rib. The coronary artenes that nourish the
myocardium arise from the AORTA. The coronary sinus empties
into the RIGHT ATRIUM . Relative to the roles of the heart chambers, the
ATRIA are receiving chambers, whereas the VENTRICLES are
discharging chambers. The membrane that lines the heart and
also forms the valve ſaps is called the ENDOCARDIUM , The outermost
layer of the heart is called the EPICARDIUM . The fluid that fills the
pericardial sac acts to decrease FRICTION during heart activity.
The heart muscle, or myocardium, is composed of a special-
ized type of muscle tissue called CARDIAC MUSCLE
Explanation:
Answer:
d. "To prevent nutrient overdoses" is not a function of the Recommended Dietary Allowance (RDA)
Explanation:
The Recommended Dietary Allowance (RDA) is part of the system of nutrition recommendations which is the Dietary Reference Intake. The RDA considers the daily dietary intake level of a nutrient considered sufficient, so its function is to meet nutritional needs, to reduce risk of disease and to prevent nutrient deficiencies. However, to prevent nutrient overdoses RDA is not the right one to use. In that case Tolerable upper intake levels (UL) is the correct is the correct reference value to avoid excessive intake of nutrients. For example, vitamin A can be harmful in excesive amounts.
