The vertebral foramina of cervical vertebrae are in which shape?

Correct Answer: C

Rationale: The vertebral foramina of cervical vertebrae (C1-C7) are triangular, larger than in other regions, accommodating the cervical spinal cord and its mobility. Round fits thoracic/lumbar foramina more closely. Oval describes cervical bodies, not foramina. Heart-shaped is unrelated to vertebral anatomy. The triangular shape, widest at the base, reflects the cervical spine's need for space (e.g., C1's ring, C7's transition), making 'c' the correct answer per spinal anatomy.

Correct Answer: C

Rationale: Tight junctions form impermeable seals between adjacent cells, preventing substances from leaking between them, as in the gut lining to block bacteria. Gap junctions allow communication via channels for ions/small molecules, not sealing. Desmosomes anchor cells mechanically, resisting stress, not blocking passage. Hemidesmosomes tether cells to the basement membrane, not each other. Tight junctions' role in creating barriers, like in the blood-brain barrier, distinguishes them, making 'c' the correct junction type.

Correct Answer: C

Rationale: Stratified squamous epithelium forms the epidermis, multi-layered and keratinized, protecting against abrasion, UV, and pathogens, as skin's outer barrier. Simple cuboidal is for secretion (e.g., glands), simple columnar for absorption (e.g., gut), and transitional for stretching (e.g., bladder) none match skin's needs. Stratified squamous's tough, renewable structure, per integumentary system, makes 'c' correct.

Correct Answer: C

Rationale: Long bones, like the femur or humerus, are longer than wide, designed for support and movement via levers. Short bones are cuboidal (e.g., carpals), flat bones are thin (e.g., skull), and irregular bones are complex (e.g., vertebrae). Long bones' length-to-width ratio, per bone classification, makes 'c' correct.

Correct Answer: C

Rationale: Eight cranial bones form the skull's braincase: frontal, 2 parietals, 2 temporals, occipital, sphenoid, ethmoid. Options 10, 12, 14 (a, b, d) may confuse with facial bones (14 total), but cranial-specific is 8. This count, per skull anatomy, makes 'c' correct.