Within each ovary there are thousands of small sacs called

Correct Answer: B

Rationale: The correct answer is B: Graafian follicle. Within the ovary, thousands of small sacs called follicles develop and grow, with one dominant follicle eventually maturing into a Graafian follicle. This structure contains the ovum (egg) and is released during ovulation. Ova (A) are the mature eggs released from the Graafian follicle. Corpus luteum (C) forms after ovulation and produces hormones to support pregnancy. Cysts (D) are abnormal fluid-filled sacs that can develop in the ovaries, different from the normal follicles.

Correct Answer: A

Rationale: The correct answer is A: epididymis. The epididymis is a coiled tube located on the back of each testicle, approximately 16 feet long when unraveled. It plays a crucial role in sperm maturation and storage. The other choices, B: Vas deferens, C: Urethra, and D: Ureter, are incorrect as they are not coiled tubes located above the testicles and do not have the same function as the epididymis in sperm development and storage.

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.