TEAS 7 science practice

TEAS 7 science practice Related

Review TEAS 7 science practice related questions and content

Which of the following is the outermost layer of the skin, providing protection against pathogens and the environment?

  • A. Dermis
  • B. Epidermis
  • C. Hypodermis
  • D. Stratum corneum (part of the epidermis)
Correct Answer: B

Rationale: The epidermis is the correct answer as it is the outermost layer of the skin, providing protection against pathogens and the environment. It consists of multiple layers, including the stratum corneum, which is the outermost layer of the epidermis. The dermis is located beneath the epidermis, offering structural support and housing blood vessels, nerves, and glands. The hypodermis is the deepest layer of the skin, made up of fat and connective tissue that secures the skin to underlying structures. Choice A, Dermis, is incorrect as it is located beneath the epidermis. Choice C, Hypodermis, is incorrect as it is the deepest layer of the skin, not the outermost. Choice D, Stratum corneum (part of the epidermis), is not the correct answer as it is a specific layer within the epidermis and not the overall outermost layer of the skin.

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What is the primary composition of the stratum corneum, the outermost layer of the epidermis?

  • A. Keratinized dead cells
  • B. Melanocytes
  • C. Langerhans cells
  • D. Merkel cells
Correct Answer: A

Rationale: The stratum corneum, the outermost layer of the epidermis, is primarily composed of keratinized dead cells. These cells are flattened, fully keratinized, and lack nuclei, serving a protective function for the skin. Melanocytes are responsible for producing melanin, providing skin pigmentation. Langerhans cells are involved in the immune response within the skin. Merkel cells are associated with sensory functions in the skin, particularly in touch sensations. Therefore, the correct answer is A as it accurately reflects the main constituent of the stratum corneum, which acts as a barrier against external factors.

What is the function of the epiglottis?

  • A. Produces saliva
  • B. Senses taste
  • C. Prevents food from entering the windpipe
  • D. Filters blood
Correct Answer: C

Rationale: The epiglottis is a flap of cartilage located at the base of the tongue that covers the opening of the windpipe (trachea) during swallowing to prevent food and liquids from entering the airway. This action ensures that food and liquids are directed to the esophagus and down into the stomach, rather than entering the respiratory system, which could lead to choking or aspiration pneumonia. Options A, B, and D are incorrect as they describe functions of other structures in the body that are not related to the role of the epiglottis.

What happens during a physical change in matter?

  • A. A new substance with different properties is formed
  • B. The chemical composition of the substance changes
  • C. The original substance can be recovered by physical means
  • D. Energy is either released or absorbed
Correct Answer: C

Rationale: During a physical change in matter, the original substance undergoes a change in its physical state or appearance without any change in its chemical composition. This means that the original substance can be recovered by physical means, such as melting, freezing, boiling, or condensing. No new substance is formed (option A), the chemical composition remains the same (option B), and energy changes can occur but are not a defining characteristic of a physical change (option D). The ability to recover the original substance by physical means distinguishes physical changes from chemical changes.

What condition is characterized by progressive muscle weakness and wasting?

  • A. Muscular dystrophy
  • B. Myositis
  • C. Fibromyalgia
  • D. Carpal tunnel syndrome
Correct Answer: A

Rationale: Muscular dystrophy is a genetic disorder characterized by progressive muscle weakness and wasting due to mutations in genes responsible for muscle cells' structure and function. Myositis is an inflammatory muscle disease, fibromyalgia is a chronic pain condition, and carpal tunnel syndrome affects the hand and arm nerves, but none present with the progressive muscle weakness and wasting seen in muscular dystrophy.

What is the relationship between work and energy?

  • A. Work is the rate of energy transfer
  • B. Work and energy are the same concepts
  • C. Work is the result of energy
  • D. Work changes an object's energy from one form to another
Correct Answer: A

Rationale: Work is defined as the transfer of energy from one system to another. It is the rate at which energy is transferred or converted. Therefore, work is the rate of energy transfer, making option A the correct choice. Work involves the transfer or conversion of energy, but it is not the same as energy itself, nor is it the result of energy. Additionally, work does not change an object's energy from one form to another; instead, it involves the transfer of energy.

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