melanin the pigment responsible for skin color is produced by
Logo

Nursing Elites

ATI TEAS 7

TEAS 7 practice test free science

1. Melanin, the pigment responsible for skin color, is produced by

Correct answer: B

Rationale: Melanocytes are the cells responsible for producing melanin, the pigment that determines skin color. Melanin gives skin its color and protects it from the harmful effects of UV radiation. Keratinocytes produce keratin, a tough protein that forms the outer layer of the skin, hair, and nails. Sebocytes produce sebum, an oily substance that helps moisturize and protect the skin. Langerhans cells are a type of immune cell found in the skin that play a role in protecting against infections and foreign substances but do not produce melanin.

2. Which sentence uses comma splices incorrectly?

Correct answer: C

Rationale: Option (C) incorrectly combines two independent clauses with only a comma, resulting in a comma splice. A comma should not be used to connect independent clauses; instead, a semicolon, conjunction, or period is needed to properly separate the ideas in the sentence. Choices (A), (B), and (D) do not contain comma splices and present their ideas in a grammatically correct manner.

3. What are the components of the male internal genitalia and their functions?

Correct answer: B

Rationale: The testes play a crucial role in male reproduction by producing sperm and testosterone. Sperm production is essential for fertility, while testosterone is responsible for the development of secondary sexual characteristics. The epididymis functions to store and mature sperm, allowing them to become motile. The prostate gland, not listed among the choices, secretes fluid that nourishes and protects sperm. The urethra serves the purpose of conducting both urine and semen out of the body, enabling the excretion of waste and reproductive fluids.

4. Select the meaning of the highlighted word in the sentence based on the context clues: If you wake up outside in your pajamas in the middle of the night, you may be a 'somnambulist'.

Correct answer: D

Rationale: The correct answer is D: 'Sleepwalker'. The word 'somnambulist' refers to a sleepwalker, as indicated by the context of waking up outside in pajamas in the middle of the night. A sleepwalker is someone who walks while asleep, and this matches the situation described in the sentence. Choices A, B, and C are incorrect because they do not align with the behavior of walking during sleep, which is characteristic of a somnambulist/sleepwalker.

5. Which of the following blood vessels carries oxygenated blood from the lungs to the heart?

Correct answer: A

Rationale: The correct answer is A: Pulmonary vein. The pulmonary vein carries oxygenated blood from the lungs to the heart. It is essential to distinguish between the pulmonary vein (A) and the pulmonary artery (B) in this context. The pulmonary vein transports oxygenated blood, while the pulmonary artery carries deoxygenated blood from the heart to the lungs for oxygenation. The aorta (C) functions as the main artery that delivers oxygenated blood from the heart to the body's tissues, while the vena cava (D) returns deoxygenated blood from the body to the heart.

Similar Questions

Which of the following is the main organ responsible for regulating blood pressure?
Which of the following best describes a balanced force acting on an object?
What is the temperature of 35°C in Kelvin?
Which of the following words is spelled correctly?
Which of the following statements about fungi is FALSE?

Access More Features

ATI TEAS Premium Plus
$149.99/ 90 days

  • Actual ATI TEAS 7 Questions
  • 3,000 questions with answers
  • 90 days access

ATI TEAS Basic
$49/ 30 days

  • 3,000 Questions with answers
  • 30 days access

Other Courses