Homeostasis is defined as:
A. Ability of human beings to keep body weight within normal limits
B. Maintenance of a constant external temperature inside a room
C. Ingestion of enough food to keep hunger pains from developing
D. Tendency of the body to maintain a stable environment
Homeostatic mechanisms are involuntary actions by organs, glands, tissues and cells to maintain balance within the body. If a function is disrupted the body will readjust in an attempt to maintain balance. During periods of starvation the body will break down glucose reserves in order to maintain normal glucose levels.
Therefore, the Correct Answer is D.
More Questions on TEAS 7 Science
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Q #1: Which of the following answers shows CH4 +2O2=CO2 +H2O as balanced?
A. CH4 + 2O2 = 2CO2 + 2H2O
B. 2CH4 + 4O2 = 2CO2 + H2O
C. 2CH4 + O2 = 2CO2 + H2O
D. CH4 + 2O2 = CO2 + 2H2O
Answer Explanation
For the formula CH4 + 2O2 = CO2 + H2O to be balanced there must be an equal number of molecules on both the reactant and product sides. In this case, for the formula to be balanced, a coefficient of a 2 needs to be placed in front of the O2 and the H2O molecules. This would make both the reactant and product sides have one carbon, four hydrogens, and four oxygens
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Q #2: Which of the following are formed when the plasma membrane surrounds a particle outside of the cell?
A. Golgi bodies
B. Rough endoplasmic reticulum
C. Secretory vesicles
D. Endocytic vesicles
Answer Explanation
Endocytosis is a process by which cells absorb larger molecules or even tiny organisms, such as bacteria, that would not be able to pass through the plasma membrane. Endocytic vesicles containing molecules from the extracellular environment often undergo further processing once they enter the cell.
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Q #3: Which of the following orbitals is the last to fill?
A. 1s
B. 3s
C. 4p
D. 6s
Answer Explanation
Of these orbitals, the last to fill is 6s.
Orbitals fill in the following order: 1s, 25, 2p. 35, 3p, 4s, 3d, 4p, 55, 4d, 5p. 6s, 4f, 5d, 6p. 7s, 5f, 6d, and 7p. The number is the orbital number, and the letter is the sublevel identification. Sublevels has one orbital and can hold a maximum of two electrons. Sublevel p has three orbitals and can hold a maximum of six electrons. Sublevel d has five orbitals and can hold a maximum of 10 electrons, Sublevel f has seven orbitals and can hold a maximum of 14 electrons.
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Q #4: A doctor needs to convince his boss to approve a test for a patient. Which statement below best communicates a scientific argument that justifies the need for the test?
A. The patient looks like he needs this test.
B. The doctor feels that the patient needs this test.
C. The patient's symptoms and health history suggest that this test will enable the correct diagnosis to help the patient.
D. The patient has excellent insurance that will pay for several tests, and the doctor would like to run as many tests as possible.
Answer Explanation
A scientific argument should be based on measurable and observable facts such as the patient's current symptoms and health history. Discussing the patient's appearance or the doctor's feelings does not communicate a scientific argument. While insurance may be a factor in most healthcare systems, the status of the patient's Insurance does not communicate a scientific argument that justifies the need for the test
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Q #5: Which of the following is NOT true concerning correlation?
A. Correlation can show the relationship between variables.
B. Correlation can show cause and effect.
C. Correlation can show linear relationships.
D. Correlation can show nonlinear relationships.
Answer Explanation
Correlations may be positive or negative and linear or nonlinear. However, correlation does not determine cause and effect. Correlation does not necessarily mean causation.
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Q #6: Which of the following statements is FALSE?
A. An organelle is a specialized structure in a cell, such as a ribosome.
B. An organ is made up of similar tissues that perform the same function.
C. Organ systems are two or more organs performing similar functions.
D. A tissue contains a single cell type that works to perform a specific function.
Answer Explanation
A tissue contains a variety of cell types that work in conjunction to perform similar functions.
The cells are similar in structure despite being located throughout the body. There are four types of tissues in the human body: connective, epithelial, muscle, and nervous system tissues.
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Q #7: Which of the following is NOT provided as a result of the valid research and observations recorded by scientists?
A. A better understanding of the physical world
B. The ability to predict possible outcomes affected by actions
C. The ability to prevent earthquakes and other natural disasters
D. The creation of various substances and technologies that enhance our world
Answer Explanation
Scientists make observations, gather data, and complete research over many years in order to compile knowledge that will provide insight into future disasters, such as earthquakes, storms, and global warming. Although science can be used to predict earthquakes and other natural disasters, there is currently no way of preventing them from occurring.
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Q #8: Which of the following statements best defines an organelle?
A. Layer of polysaccharides outside the plasma membrane of cells
B. Abnormal Infectious proteins
C. Specialized structures within a cell
D. Collection of tissues used to serve a specific function
Answer Explanation
Organelles are specialized structures within a cell that serve a specific function. For example, mitochondria supply energy to the cell by generating adenosine triphosphate. Ribosomes are the site for protein synthesis. The nucleus is in charge of all of the activities of the cell.
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Q #9: How many different types of nucleotides are there in DNA?
A. One
B. Two
C. Four
D. Eight
Answer Explanation
There are four different nucleotides in DNA. Nucleotides are monomers of nucleic acids, composed of five- carbon sugars, a phosphate group, and a nitrogenous base. Nucleotides make up both DNA and RNA. They are essential for the recording of an organism's genetic information, which guides the actions of the various cells of the body.
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Q #10: How many tissue layers does the uterus have?
A. One
B. Two
C. Three
D. Four
Answer Explanation
The uterus has three layers. The inner layer is called the endometrium. The middle layer is called the myometrium. The outer layer of the uterus is called the serosa or perimetrium.
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