Describe the role of skin in thermoregulation
What will be an ideal response?
Thermoregulation is the maintenance of a stable body temperature. When body temperature increases, the hypothalamus triggers the sweat glands to increase sweating and adjusts blood flow through the dermis via cutaneous vasodilation. The evaporation of sweat produces a cooling effect. The dilation of vessels in the dermis allows for radiation and loss of heat into the environment. In contrast, in order to reduce heat loss from the skin when body temperature drops, dermal blood vessels are constricted.
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The portion of the adult brain that includes the cerebral peduncles, superior colliculi, and inferior colliculi is derived from which secondary brain vesicle?
A. Telencephalon B. Diencephalon C. Myelencephalon D. Metencephalon E. Mesencephalon
The Golgi complex is functionally connected to the ER
Indicate whether the statement is true or false
If 0.9% NaCl (saline) solution is isotonic to a cell, then a 0.5% saline solution
A. will cause crenation of the cell. B. will not affect the cell. C. will shrink the cell. D. is hypertonic to the cell. E. is hypotonic to the cell.
Homeostasis depends on the activity of body systems to adjust a variable. Because our bodies work so well to maintain variables at set point, we often do not even notice the systems they use to do it. But in someone who is ill, these systems may not be able to maintain homeostasis; you need to be aware of this to head off possible problems.