Which of the following are examples of homeostatic mechanisms?
A. Increasing heart rate when blood pressure is low, Consuming excess calories to gain weight
B. Lifting weights to increase muscle mass
C. Shivering when the body temperature falls
D. Shivering when the body temperature falls, Secreting insulin to decrease blood sugar concentration, Increasing heart rate when blood pressure is low
Homeostatic mechanisms are involuntary actions by organs, glands, tissues and cells to maintain balance within the body. For example, if a person becomes dehydrated, the kidneys will retain fluid by decreasing urine output.
Consuming excess calories and lifting weights are not involuntary actions, nor do they maintain the body in its baseline state. Rather, they are actions specifically taken to move the body away from its baseline.
Therefore, the Correct Answer is D.
More Questions on TEAS 7 Science
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Q #1: Which is NOT a type of protein?
A. Fibrous
B. Membrane
C. Globular
D. Unsaturated
Answer Explanation
There are three types of proteins: fibrous, membrane, and globular. Fibrous or structural proteins consist of collagen, elastin, and keratin. Membrane proteins are interactive and anchored to a membrane. Globular proteins consist of functional proteins like enzymes, hemoglobin, and insulin.
Therefore unsaturated is the correct answer.
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Q #2: Identify the location where neurotransmitters are stored immediately prior to use.
A. Area A
B. Area B
C. Area C
D. Area D
Answer Explanation
Area B is a synaptic vesicle where the neurotransmitters are stored just before use.
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Q #3: What types of reaction is Cu (s) + 2AgNO3(aq) → 2Ag(s) + Cu(NO3)2(aq)?
A. Single replacement
B. Double replacement
C. Synthesis
D. Decomposition
Answer Explanation
This is a single replacement reaction in which copper replaces silver. The copper combines with the nitrate ions, and the silver precipitates out. Single replacement reactions have the general form of
A + BC →
AC + B. Double replacement reactions have the general form of AB + CD→
AD + CB. Synthesis reactions have the general form of A + B →
AB. Decomposition reactions have the general form AB→
A+B.
