HESI A2 Anatomy and Physiology Practice Test 2023

Correct Answer: B

Rationale: The correct answer is B: Hyoid. The hyoid bone is unique as it does not directly articulate with any other bone in the body, making it a free-floating bone. It serves important functions in supporting the tongue and aiding in swallowing. A: Scapula articulates with the clavicle and humerus. C: Radius articulates with the ulna, humerus, and carpal bones. D: Femur articulates with the hip bone and tibia. Therefore, the hyoid bone is the only bone in the body that does not directly articulate with another bone.

Correct Answer: B

Rationale: The correct answer is B: To pump blood throughout the body. The heart's primary function is to act as a muscular pump that circulates blood, delivering oxygen and nutrients to the body's tissues and removing waste products. It plays a crucial role in maintaining the flow of blood through the circulatory system. Explanation of other choices: A: To filter blood - This is incorrect, as the kidneys are responsible for filtering blood. C: To absorb oxygen - This is incorrect, as the lungs are responsible for absorbing oxygen. D: To remove carbon dioxide - This is incorrect, as the lungs are responsible for removing carbon dioxide during respiration.

Correct Answer: B

Rationale: The correct answer is B: Urethra. The urethra is a structure that is part of both the male reproductive system and the urinary system. In males, the urethra serves as the passage for both urine and semen. It connects the urinary bladder to the outside of the body. The other choices are incorrect because: A: Bladder is solely part of the urinary system, storing urine. C: Prostate is an accessory gland in the male reproductive system, producing fluids for semen. D: Seminal Vesicle is also part of the male reproductive system, producing seminal fluid.

Correct Answer: B

Rationale: The correct answer is B: Vitamin K. Vitamin K is necessary for blood clotting as it helps in the synthesis of clotting factors in the liver. Without adequate vitamin K, the blood may not clot properly, leading to excessive bleeding. Vitamin D (Choice A) is important for bone health, not blood clotting. Vitamin C (Choice C) is essential for collagen synthesis and immune function, but not directly involved in blood clotting. Vitamin B12 (Choice D) is crucial for nerve function and red blood cell production, but not specifically for blood clotting.

Correct Answer: A

Rationale: The correct answer is A: four. The four main types of tissues in the human body are epithelial, connective, muscle, and nervous tissues. Epithelial tissues cover and line body surfaces, connective tissues provide support and structure, muscle tissues allow movement, and nervous tissues transmit signals. The other choices are incorrect because there are not six, eight, or ten main types of tissues in the human body. These choices are not consistent with the widely accepted classification of tissues in human anatomy and physiology.