In a negative feedback loop used to maintain homeostasis, which of the following terms is NOT likely to be used?
set point
integrating center
keratinized, stratified squamous epithelium
effector
The organ that best regulates body temperature is the
skin
brain
kidney
heart
Most often, the integrating center in a feedback loop will be located within the _______.
peripheral nervous system
central nervous system
effectors
Homeostasis is best conceived as a state of
negative feedback
positive feedback
dynamic constancy
hormone and nerve regulation
Which of the following is NOT a primary tissue?
Connective
Epithelial
Squamous
Nervous
Which of the following glands has both endocrine and exocrine functions?
Mammary glands
Pancreas
Adrenal glands
Prostate
The scattered fibrous protein characteristic of many connective tissues is
dentin
keratin
cartilage
collagen
The skin secretes sweat, and thus is an exocrine organ. It is also considered an endocrine gland because it
synthesizes and secretes sebum
synthesizes and secretes vitamin D
stores and releases fat
plays an important role in our immune functioning
Like most physiological parameters, blood pH is very tightly regulated and rarely falls outside the narrow range of 7.35-7.45 in healthy individuals.
Always true
Sometimes true
Never true
Positive feedback loops have antagonistic effectors that work together to continuously move a particular variable toward a set point.
Organs possess all four types of tissue.
When the level of calcium ions in our blood strays too far away from the set point, more of the hormone calcitonin is released from the parathyroid glands.
Pluripotent stem cells can divide, grow and differentiate into any specialized type of cell in the body.
A primary function of an organ system is to maintain homeostasis.
Check all the statements that are true regarding the diagram.
When moving from a reclining to a standing position, gravity causes a drop in blood pressure in the head.
Pressure receptors in blood vessels signal the central nervous system when there is a significant change in blood pressure.
In this reflex, the pressure receptors are the effectors.
If this reflex does not function properly, a person may faint due to lack of blood flow to the brain.
Increased heart rate, leads to increased cardiac output, which raises blood pressure.
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