You review anatomy, chemistry, and scientific reasoning the way TEAS 7 reports the science line. Five of the 15 questions include the correct answer and rationale. The other ten keep answers in the study hub. Continue with the ATI TEAS 7 exam guide or more ATI TEAS 7 practice questions.
Five science questions with answers
Cover the key. Write the first action. Then open the rationale and name why the other choices fail.
Question 1
Dense irregular connective tissue, found in tendons and ligaments, provides:
A. Flexibility
B. Lubrication
C. Insulation
D. Tensile strength
Show answer and rationale
Correct answer: D — Tensile strength
Dense irregular connective tissue, found in tendons and ligaments, provides tensile strength. Tendons and ligaments need to withstand tension and forces acting upon them, and the dense irregular connective tissue helps provide this strength and support. Choice A, flexibility, is incorrect because tendons and ligaments primarily provide support and stability rather than flexibility. Choice B, lubrication, is not the main function of dense irregular connective tissue in tendons and ligaments. Choice C, insulation, is also incorrect as this tissue type is not primarily involved in providing insulation.
Question 2
What is the name of the curved bone in the back that provides support and attachment for muscles?
A. Sternum
B. Scapula
C. Clavicle
D. Vertebral column
Show answer and rationale
Correct answer: D — Vertebral column
The vertebral column, also known as the spine, is the curved bone in the back that provides support and attachment for muscles. It consists of individual vertebrae stacked on top of each other, forming a flexible and protective structure for the spinal cord. The sternum, scapula, and clavicle are bones in the chest and shoulder regions, not in the back where the vertebral column is located. Therefore, the correct answer is the vertebral column (Option D). Options A, B, and C are incorrect as they are bones situated in the chest and shoulder areas, not in the back where the vertebral column is found.
Question 3
Melatonin is a hormone produced by the pineal gland. What is its primary function?
A. Regulate blood pressure
B. Stimulate the digestive system
C. Control sleep-wake cycles
D. Maintain bone density
Show answer and rationale
Correct answer: C — Control sleep-wake cycles
Melatonin is primarily known for its role in controlling sleep-wake cycles. It is produced by the pineal gland in response to darkness, helping signal the body that it is time to sleep. Melatonin levels typically rise in the evening and stay elevated throughout the night, promoting sleep. Choices A, B, and D are incorrect as melatonin's primary function is not to regulate blood pressure, stimulate the digestive system, or maintain bone density. While melatonin may have some indirect effects on these functions, its main role lies in regulating the circadian rhythm and promoting a restful sleep cycle.
Question 4
Following successful heart transplant surgery, the patient's body will need to take medications to:
A. Suppress the immune system and prevent rejection of the new heart.
B. Reduce overall blood pressure.
C. Dissolve any remaining blood clots.
D. Stimulate the growth of new heart tissue.
Show answer and rationale
Correct answer: A — Suppress the immune system and prevent rejection of the new heart.
After heart transplant surgery, the patient's body will need to take medications to suppress the immune system and prevent rejection of the new heart. This is essential to ensure that the body does not identify the transplanted heart as a foreign entity and mount an immune response against it, which could lead to transplant rejection and failure. Choices B, C, and D are incorrect because post-heart transplant medications primarily focus on preventing rejection by suppressing the immune system, rather than reducing blood pressure, dissolving blood clots, or stimulating the growth of new heart tissue.
Question 5
What is the cellular function of cilia and flagella?
A. Cilia and flagella are responsible for cell movement.
B. Cilia and flagella synthesize proteins.
C. Cilia and flagella help protect the cell from its environment.
D. Cilia and flagella have enzymes that help with digestion.
Show answer and rationale
Correct answer: A — Cilia and flagella are responsible for cell movement.
The correct answer is A: Cilia and flagella are responsible for cell movement. Cilia and flagella are specialized structures found on the surface of many types of cells. They are involved in the movement of the cell itself or in moving substances around the cell. This movement helps in various functions such as propulsion, moving fluids, and sensing the environment. Choices B, C, and D are incorrect. Cilia and flagella are not involved in synthesizing proteins, protecting the cell from its environment, or aiding in digestion. Their primary function is related to cell movement and cellular transport.
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Question 6
Which of the following is the region of the brain that controls and regulates autonomic functions such as respiration, digestion, and heart rate?
A. cerebellum
B. medulla oblongata
C. temporal lobe
D. cerebral cortex
Correct answer:
The medulla oblongata is the correct answer. It is the region of the brain located at the base of the brainstem responsible for regulating autonomic functions such as respiration, digestion, and heart rate. These functions are essential for maintaining life. The cerebellum (Option A), temporal lobe (Option C), and cerebral cortex (Option D) do not control these autonomic functions. The cerebellum is mainly involved in coordination and balance, the temporal lobe is associated with memory and hearing, and the cerebral cortex is responsible for higher brain functions like thinking and decision-making.
Which of the following is a dense, interconnected mass of nerve cells located outside the central nervous system?
A. ganglion
B. dendrite
C. cranial nerve
D. pons
Correct answer:
A ganglion is a dense, interconnected mass of nerve cells located outside the central nervous system. Ganglia serve as relay points where nerve cells communicate and integrate signals. They are found along peripheral nerves, processing sensory information and coordinating motor responses. Choice B, dendrite, refers to a part of a neuron that receives signals, not a mass of nerve cells. Choice C, cranial nerve, is a bundle of nerves that emerge from the brain, not a mass of nerve cells. Choice D, pons, is a part of the brainstem, which is within the central nervous system, not located outside of it.
How does the body maintain a relatively constant blood pH level, even with changes in blood carbon dioxide concentration?
A. Cellular respiration
B. Gas exchange
C. Buffering system
D. Deoxygenation
Correct answer:
The correct answer is C: Buffering system. The buffering system is responsible for maintaining a relatively constant blood pH level by minimizing changes in pH when acids or bases are added to the blood. This system consists of chemical compounds that can donate or accept protons to help stabilize the pH. Choice A, Cellular respiration, and Choice B, Gas exchange, are processes involved in gas exchange within the body, not specifically related to maintaining blood pH. Choice D, Deoxygenation, refers to the removal of oxygen from a substance and is not directly related to the regulation of blood pH.
The correct answer is B: Luteinizing Hormone. The pituitary gland releases luteinizing hormone, which plays a crucial role in reproductive functions by stimulating ovulation in females and testosterone production in males. Choice A, Estrogen, is incorrect as estrogen is mainly produced by the ovaries. Choice C, Progesterone, is incorrect as progesterone is produced by the corpus luteum in the ovaries and the placenta during pregnancy. Choice D, Testosterone, is incorrect as testosterone is produced primarily in the testes in males and in smaller amounts in the ovaries and adrenal glands in females.
The outermost layer of your skin, responsible for waterproofing and providing a barrier against pathogens, is the:
A. Stratum basale (Basal layer)
B. Stratum corneum
C. Stratum granulosum
D. Stratum spinosum
Correct answer:
The correct answer is B: Stratum corneum. The stratum corneum is the outermost layer of the epidermis, consisting of dead skin cells that are constantly shed and replaced. It serves as a protective barrier against pathogens and helps to prevent water loss from the body. Choice A, Stratum basale, is the deepest layer of the epidermis where new skin cells are produced. Choice C, Stratum granulosum, is a layer of the epidermis where the cells begin to flatten and lose their nuclei. Choice D, Stratum spinosum, is a layer of the epidermis where cells become irregular in shape and have spiny projections.
Which element is found in water and is crucial for biological functions like nerve impulses and muscle contraction?
A. Sodium
B. Potassium
C. Calcium
D. Magnesium
Correct answer:
The correct answer is Sodium. Sodium is found in water and is crucial for biological functions like nerve impulses and muscle contraction. It plays a key role in maintaining electrolyte balance and transmitting nerve impulses, affecting both muscles and nerves. Potassium (Choice B), although essential for nerve function and muscle control, is not typically found in water. Calcium (Choice C) is important for bone health and muscle function, but it is not the element found in water. Magnesium (Choice D) is also essential for various biological functions but is not the element commonly found in water.
When baking soda (sodium bicarbonate) reacts with vinegar (acetic acid), what type of reaction occurs?
A. Combustion
B. Double displacement
C. Decomposition
D. Synthesis
Correct answer:
When baking soda (sodium bicarbonate) reacts with vinegar (acetic acid), a double displacement reaction occurs. In this reaction, the positive ions in baking soda switch places with the positive ions in vinegar to form water, carbon dioxide, and a salt. Combustion involves a reaction with oxygen to produce heat and light energy. Decomposition is the breakdown of a compound into simpler substances, which is not the case in the given reaction. Synthesis is the combination of substances to form a more complex compound, which is also not the type of reaction observed when baking soda and vinegar react.
What is the scientific study of the relationships between organisms and their environment?
A. Zoology
B. Botany
C. Ecology
D. Genetics
Correct answer:
Ecology is the scientific study of the relationships between organisms and their environment, including the interactions between living organisms and their physical surroundings. This field focuses on how organisms interact with each other and their environment. Zoology is the study of animals, Botany is the study of plants, and Genetics is the study of genes and heredity, which are not directly related to the relationships between organisms and their environment. Therefore, the correct answer is Ecology as it specifically deals with the interactions between living organisms and their environment.
What type of force enables a car to take a sharp turn while moving in a circular path?
A. Centripetal force
B. Tension force
C. Frictional force
D. Gravitational force
Correct answer:
Centripetal force is the force that allows an object to move in a circular path. When a car takes a sharp turn, centripetal force acts towards the center of the circle, enabling the car to stay in the curved path. Tension force is transmitted through a string, rope, cable, or wire when pulled tight, and it is not directly related to a car's turning motion. Frictional force opposes motion and is not the primary force responsible for a car's ability to take a sharp turn. Gravitational force is the attraction between masses and does not directly influence a car's ability to maneuver in a curved path.
What is the term for the distance between the center of a lens or curved mirror and its focal point?
A. Aperture
B. Focal length
C. Refractive index
D. Lens thickness
Correct answer:
The correct answer is B: Focal length. Focal length is the distance between the center of a lens or curved mirror and its focal point. It determines how strongly the lens converges or diverges light, affecting the image formation. Aperture, choice A, refers to the opening through which light enters the lens, controlling the amount of light passing through. Refractive index, choice C, measures how much light bends when passing through a medium, affecting the speed of light. Lens thickness, choice D, is the physical dimension of the lens, influencing optical properties and compatibility with frames.
ATI TEAS 7 science practice questions, set 75 for nursing students in the United States. Fifteen items. Five include answers and rationales in American English.
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The first five questions already include the rationale. Start full practice to unlock the remaining keys, missed-question review, and the rest of the bank.
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