ATI TEAS Version 7 - Science
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Free ATI TEAS Version 7 - Science Questions
|
Solution in bag |
Solution outside bag |
Bag mass change (g) |
|
water |
water |
-0.2 |
|
20% sucrose |
water |
+2.4 |
|
40% sucrose |
water |
+4.3 |
|
60% sucrose |
water |
+5.8 |
-
Bag mass change
-
Temperature
-
Sucrose concentrations
-
Duration
Explanation
Correct Answer A. Bag mass change
Explanation:
The dependent variable is the one that is measured or observed in response to changes in the independent variable. In this experiment, the mass change of the bag is being measured to see how it is affected by different sucrose concentrations in the solution. Therefore, bag mass change is the dependent variable because it depends on the conditions of the experiment, particularly the sucrose concentration.
Why Other Options Are Wrong:
B. Temperature
Temperature was kept constant at 4°C, meaning it was controlled, not changed or measured as a result. Therefore, it is a controlled variable, not the dependent one.
C. Sucrose concentrations
This is the independent variable, which is what the experimenter changes to observe its effect on the dependent variable (bag mass change).
D. Duration
Time (duration of 4 hours) was held constant for all test groups, so it is also a controlled variable, not the one being measured.
Which of the following substances in the blood increases when parathyroid hormone is released
-
Iron
-
Calcium
-
Sodium
-
Potassium
Explanation
Correct Answer B. Calcium
Explanation:
Parathyroid hormone (PTH) is secreted by the parathyroid glands in response to low blood calcium levels. Its primary function is to increase the concentration of calcium in the blood. PTH achieves this by stimulating osteoclasts to break down bone tissue, releasing calcium into the bloodstream, increasing calcium reabsorption by the kidneys, and promoting the activation of vitamin D, which enhances intestinal absorption of dietary calcium. These combined actions effectively raise blood calcium levels to maintain homeostasis.
Why the Other Options Are Incorrect:
A. Iron
Iron is primarily involved in oxygen transport through hemoglobin in red blood cells and is regulated by different mechanisms, such as dietary absorption and storage in the liver and spleen. It is not directly influenced by parathyroid hormone.
C. Sodium
Sodium is a key electrolyte involved in fluid balance and nerve function. Its levels are regulated mainly by hormones like aldosterone and antidiuretic hormone (ADH), not by parathyroid hormone.
D. Potassium
Potassium plays a vital role in nerve signaling and muscle contraction, with its concentration controlled by aldosterone and kidney function. Parathyroid hormone does not regulate potassium levels in the blood.
- A. The attraction between the relatively positive areas of one molecule and the relatively negative areas of another molecule.
- B. The repulsion between the positive and negative charges of two molecules.
- C. The attraction between two nonpolar molecules.
- D. The attraction between two ionic molecules.
Explanation
- A. Cells are alive and recognized as the building blocks for life.
- B. Scientists can identify and differentiate cells by using a microscope.
- C. Cells are produced from existing cells using meiosis instead of mitosis.
- D. Living things are composed of a single cell that remains undifferentiated.
Explanation
Which of the following are the two major parts of the nervous system
-
Autonomic nervous system and somatic nervous system
-
Peripheral nervous system and somatic nervous system
-
Autonomic nervous system and central nervous system
-
Peripheral nervous system and central nervous system
Explanation
Correct Answer D. Peripheral nervous system and central nervous system
Explanation:
The nervous system is divided into two main parts: the central nervous system (CNS), which includes the brain and spinal cord, and the peripheral nervous system (PNS), which includes all the nerves outside the CNS. The PNS connects the CNS to limbs and organs. The PNS is further divided into the somatic and autonomic nervous systems, but these are subdivisions, not the primary structural divisions.
Why Other Options Are Wrong:
A. Autonomic nervous system and somatic nervous system
These are both parts of the PNS, not the two major divisions of the entire nervous system.
B. Peripheral nervous system and somatic nervous system
The somatic nervous system is a subset of the peripheral nervous system, not a main part on its own.
C. Autonomic nervous system and central nervous system
The autonomic nervous system is also a subset of the peripheral nervous system and not a major structural component at the highest level.
Which of the following endocrine organs in the diagram below is involved in regulating milk production following childbirth
-
↵
Adrenal glands
-
Pituitary gland
-
Ovaries
-
Thyroid gland
Explanation
Correct Answer B. Pituitary gland
Explanation of Correct Answer:
The pituitary gland, labeled as A in the diagram, is responsible for producing prolactin, a hormone that stimulates milk production in the mammary glands after childbirth. It also releases oxytocin, which promotes milk ejection during breastfeeding.
Why the Other Options Are Incorrect:
A. Adrenal glands (labeled B) – These glands produce hormones like cortisol and adrenaline, which help with stress response and metabolism but are not involved in milk production.
C. Ovaries (labeled D) – The ovaries produce estrogen and progesterone, which support reproduction but do not directly regulate lactation.
D. Thyroid gland (labeled C) – The thyroid controls metabolism through thyroid hormones but has no direct role in milk production.
Which of the following is a function of the integumentary system?
-
Production of antibodies
-
Storage of fat
-
Release of minerals
-
Absorption of water
Explanation
Correct Answer:
Storage of fat
Explanation:
The integumentary system, which includes the skin, hair, nails, and associated glands, plays several roles in the body, one of which is the storage of fat in the subcutaneous layer (hypodermis). This layer acts as insulation, energy storage, and padding to protect underlying tissues. Fat storage in this layer helps maintain body temperature and serves as a reserve for metabolic needs.
Why Other Options Are Wrong:
Production of antibodies
This function belongs to the immune system, particularly B lymphocytes, which generate antibodies to target pathogens. The integumentary system acts as a physical barrier but does not directly produce antibodies.
Release of minerals
Mineral release and storage are primarily functions of the skeletal system, especially bones. The integumentary system does not store or release minerals like calcium or phosphorus, so this choice is incorrect.
Absorption of water
The integumentary system is designed to prevent water loss and block the absorption of water. The skin's outer layer (stratum corneum) acts as a barrier, not a sponge, making this function incompatible with its actual role.
Which of the following terms describes the relaxation of the chambers of the heart during the cardiac cycle
-
Bradycardia
-
Diastole
-
Systole
-
Tachycardia
Explanation
Correct Answer B. Diastole
Explanation:
Diastole is the phase of the cardiac cycle during which the heart chambers relax and fill with blood. It follows systole, the contraction phase where the heart pumps blood out.
Why Other Options Are Wrong:
A. Bradycardia
Bradycardia refers to an abnormally slow heart rate, not a phase of the cardiac cycle.
C. Systole
Systole is the phase when the heart contracts to pump blood out, opposite of relaxation.
D. Tachycardia
Tachycardia refers to an abnormally fast heart rate, not a phase of contraction or relaxation.
- A. Perforins
- B. Cytokines
- C. Granzymes
- D. Interferons
Explanation
Which of the following summarizes a change that takes place as a solid turns to a liquidWhich of the following summarizes a change that takes place as a solid turns to a liquid
-
Particles become less ordered.
-
Particles move closer together.
-
Intermolecular forces between particles become stronger.
-
Particles have a decrease in mobility.
Explanation
Correct Answer A. Particles become less ordered.
Explanation:
When a solid melts into a liquid, its particles gain energy, move more freely, and become less orderly. The rigid, fixed structure of a solid breaks down, allowing particles to flow past each other in the liquid state.
Why Other Options Are Wrong:
B. Particles move closer together.
In melting, particles typically move slightly farther apart, not closer.
C. Intermolecular forces between particles become stronger.
Intermolecular forces generally weaken during melting as particles gain energy.
D. Particles have a decrease in mobility.
Particle mobility increases when a solid becomes a liquid.
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