Nokea
What is the primary hormone released by the parathyroid glands?
- A. Insulin
- B. Calcitonin
- C. Parathyroid hormone (PTH)
- D. Thyroxine
Correct Answer: C
Rationale: The primary hormone released by the parathyroid glands is parathyroid hormone (PTH). PTH plays a crucial role in regulating calcium and phosphorus levels in the body by increasing calcium levels in the blood through various mechanisms, such as promoting calcium release from bones and increasing calcium absorption in the intestines. Insulin is produced by the pancreas and regulates blood sugar levels, calcitonin is produced by the thyroid gland and helps lower blood calcium levels, and thyroxine is a hormone produced by the thyroid gland that regulates metabolism. Therefore, choices A, B, and D are incorrect as they are not the primary hormone released by the parathyroid glands.
You may also like to solve these questions
What is the formula for calculating density?
- A. Density = Volume / Mass
- B. Density = Mass Volume
- C. Density = Mass / Volume
- D. Density = Volume - Mass
Correct Answer: A
Rationale: Density is defined as the amount of mass in a given volume. The formula for calculating density is Density = Mass / Volume. This means that you divide the mass of an object by its volume to determine its density. Therefore, the correct formula for calculating density is Density = Volume / Mass. Choice A is correct because density is calculated by dividing the volume by the mass. Choices B, C, and D are incorrect because they do not represent the correct relationship between mass and volume in calculating density.
What happens to the kinetic energy of an object when its mass is doubled?
- A. Kinetic energy remains the same
- B. Kinetic energy halves
- C. Kinetic energy doubles
- D. Kinetic energy quadruples
Correct Answer: A
Rationale: The correct answer is that the kinetic energy remains the same. Kinetic energy is directly proportional to the mass of an object and the square of its velocity. When the mass is doubled, the kinetic energy would increase if the velocity remains constant. However, in this question, only the mass is mentioned, not the velocity. Therefore, when the mass is doubled, the kinetic energy remains the same as long as the velocity remains constant. Choices B, C, and D are incorrect because they incorrectly suggest changes in kinetic energy that do not accurately reflect the relationship between mass and kinetic energy described in the question.
Which element has the same number of protons and neutrons?
- A. Carbon (C)
- B. Oxygen (O)
- C. Lithium (Li)
- D. Helium (He)
Correct Answer: D
Rationale: The correct answer is Helium (He). Helium has an atomic number of 2, meaning it has 2 protons. It also has 2 neutrons, which gives it a total mass number of 4. Therefore, Helium is an example of an element with an equal number of protons and neutrons.
Choice A (Carbon) has 6 protons and usually has more neutrons than protons. Choice B (Oxygen) has 8 protons and 8 neutrons, so the numbers are not equal. Choice C (Lithium) has 3 protons and usually has more neutrons than protons, so it does not fit the criteria of having the same number of protons and neutrons.
Which hormone, produced by the thyroid gland, plays a crucial role in regulating the body's metabolism, growth, and development?
- A. Calcitonin
- B. Parathyroid hormone (PTH)
- C. Thyroxine
- D. Insulin
Correct Answer: C
Rationale: Thyroxine, also known as T4, is a hormone produced by the thyroid gland that plays a crucial role in regulating the body's metabolism, growth, and development. It helps control the rate at which the body uses energy, affects protein synthesis, and influences the body's sensitivity to other hormones. Calcitonin (A) is another hormone produced by the thyroid gland, but its primary function is to regulate calcium levels in the blood. Parathyroid hormone (PTH) (B) is produced by the parathyroid glands and is involved in regulating calcium and phosphorus levels in the body. Insulin (D) is a hormone produced by the pancreas that helps regulate blood sugar levels.
Which of the following is NOT a function of the integumentary system?
- A. Regulation of body temperature
- B. Protection from pathogens
- C. Synthesis of vitamin D
- D. Production of digestive enzymes
Correct Answer: D
Rationale: The correct answer is D. The production of digestive enzymes is not a function of the integumentary system. The integumentary system is responsible for regulating body temperature, protecting the body from pathogens, and synthesizing vitamin D. Digestive enzymes are produced by organs in the digestive system, such as the pancreas and stomach, and not by the integumentary system.