Congenital opening of the male urethra on the undersurface of the penis is called:

Correct Answer: A

Rationale: Step-by-step rationale: 1. Hypospadias is the congenital opening of the male urethra on the undersurface of the penis. 2. This condition results from incomplete closure of the urethral folds during fetal development. 3. Phimosis is the inability to retract the foreskin over the glans penis. 4. Epispadias is the congenital opening of the male urethra on the upper surface of the penis. 5. Herpes is a viral infection causing painful sores, but not related to the location of the urethral opening. Summary: Hypospadias is correct as it matches the description of the condition, while the other choices describe different conditions not related to the location of the urethral opening.

Correct Answer: C

Rationale: The correct answer is C: Fontanelle. Fontanelles are soft spots in an infant's skull where the bones have not yet fully fused. They allow for the baby's brain to grow and accommodate the rapid brain development during the early months of life. Sulcus refers to a groove or furrow, sinus is a cavity within a bone, and suture is the line where two bones meet. These terms do not specifically refer to the unossified areas in an infant's skull, making them incorrect choices.

Correct Answer: D

Rationale: The correct answer is D: Acetabulum. The acetabulum is the depression in the pelvic bone where the head of the femur articulates. This articulation forms the hip joint. The glenoid fossa (A) is found in the scapula and articulates with the head of the humerus, not the femur. The mandibular fossa (B) is located in the temporal bone and articulates with the mandible, not the femur. The jugular fossa (C) is a groove in the temporal bone for the internal jugular vein, not related to the femur articulation. Therefore, the correct choice is D as it accurately describes the anatomical structure where the femur articulates with the pelvic bone.

Correct Answer: A

Rationale: The correct answer is A: Mandible. The mandible is the only movable facial bone as it forms the lower jaw and is connected to the skull by the temporomandibular joint, allowing for movements like chewing and speaking. Maxilla, Vomer, and Ethmoid are all facial bones, but they are fixed in place and do not have the same range of motion as the mandible. Maxilla forms the upper jaw, Vomer is a bone in the nasal cavity, and Ethmoid is a bone between the eyes. Therefore, the mandible is the only bone among the options that is capable of movement, making it the correct answer.

Correct Answer: D

Rationale: The correct answer is D. The urethra is a tube that carries both urine from the bladder and semen from the reproductive system. This is essential for the excretion of waste (urine) and reproduction (semen). Choice A is incorrect because the urethra carries both urine and semen. Choice B is incorrect as the urethra carries both substances, not just semen. Choice C is incorrect because the urethra carries semen and urine separately, not as a mixture. Overall, choice D is correct because the urethra can carry both semen and urine, just not simultaneously.