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Which of the following bones belongs to the category of long bones?
- A. Femur
- B. Ribs and cranial bones
- C. Sesamoid
- D. Vertebrae and hip bones
Correct Answer: A
Rationale: The correct answer is A: Femur. Long bones are characterized by their elongated shape, with examples including the femur, humerus, and tibia. These bones are essential for support, movement, and bone marrow production. Choice B, 'Ribs and cranial bones,' consists of flat bones, not long bones. Choice C, 'Sesamoid,' refers to small bones embedded within tendons and do not fall under the category of long bones. Choice D, 'Vertebrae and hip bones,' includes irregular bones that provide structural support and protection for vital organs, but they are not classified as long bones.
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What might happen if blood sugar begins to drop in the human body?
- A. The pancreas releases insulin.
- B. The liver releases stored glucose.
- C. The liver stores glucose as glycogen.
- D. The pancreas releases glucagon.
Correct Answer: D
Rationale: When blood sugar levels drop in the body, the pancreas releases glucagon. Glucagon acts to increase blood sugar levels by stimulating the liver to release stored glucose into the bloodstream. Therefore, the correct answer is D. Choice A is incorrect because the release of insulin lowers blood sugar levels, opposite of what happens when blood sugar is dropping. Choice B is incorrect as the liver releases stored glucose in response to low blood sugar, not when blood sugar is already dropping. Choice C is also incorrect as the liver stores glucose as glycogen but doesn't directly impact blood sugar levels dropping in the moment.
What function do hydrophobic proteins often provide in the body?
- A. Digestive enzymes
- B. Provide structure
- C. Carry oxygen molecules
- D. Store energy
Correct Answer: B
Rationale: Hydrophobic proteins are known for their ability to repel water and are often involved in providing structural support in cells and tissues. They help maintain the structural integrity and shape of cell membranes, organelles, and other cellular components. Choice A, digestive enzymes, typically consist of hydrophilic proteins that interact with water and substrates to facilitate digestion. Choice C, carrying oxygen molecules, is a function commonly associated with specific proteins like hemoglobin. Choice D, storing energy, is usually performed by proteins like enzymes involved in energy storage and release, such as glycogen phosphorylase.
Which of the following bones is part of the axial skeleton?
- A. Femur
- B. Humerus
- C. Skull
- D. Pelvis
Correct Answer: C
Rationale: The correct answer is C: Skull. The axial skeleton consists of bones along the body's central axis, including the skull, vertebral column, ribs, and sternum. Choices A, B, and D are incorrect because the femur, humerus, and pelvis are part of the appendicular skeleton, which comprises the bones of the limbs and girdles.
Which term refers to the space where lymph flows through the body?
- A. Artery
- B. Lumen
- C. Interstitial space
- D. Vein
Correct Answer: C
Rationale: The correct answer is C: Interstitial space. This term specifically refers to the area where lymph flows between tissues. Lymph does not flow through arteries (choice A) or veins (choice D) as these vessels carry blood. The term 'lumen' (choice B) refers to the inside space of a tubular structure, like a blood vessel, but it does not specifically denote the space where lymph flows through the body.
Which of the following best describes the process of osmosis?
- A. Movement of molecules against their concentration gradient
- B. Movement of water across a selectively permeable membrane
- C. Movement of water and solutes together
- D. Movement of large molecules through a membrane
Correct Answer: B
Rationale: The correct answer is B. Osmosis is the process where water moves across a selectively permeable membrane from an area of low solute concentration to an area of high solute concentration. Choice A is incorrect because osmosis does not involve movement against the concentration gradient. Choice C is incorrect because osmosis primarily involves the movement of water, not water and solutes together. Choice D is incorrect as osmosis specifically refers to the movement of water molecules, not large molecules, through a membrane.