Quiz: A&P 1 Midterm Practical — 25 questions

1. What distinguishes the rough endoplasmic reticulum from the smooth endoplasmic reticulum?

A. Microvilli cover the rough endoplasmic reticulum’s surface

B. Ribosomes cover the rough endoplasmic reticulum’s surface

C. Lysosomes cover the rough endoplasmic reticulum’s surface

D. Centrioles cover the rough endoplasmic reticulum’s surface

Answer: (B)

Explanation

The rough endoplasmic reticulum has surface ribosomes, which assemble proteins there. The smooth endoplasmic reticulum lacks these surface ribosomes, rather than having another organelle attached in their place.

2. Which structure is identified as the site where ribosomal components are produced within the nucleus?

A. Golgi apparatus

B. Vesicle

C. Peroxisome

D. Nucleolus

Answer: (D)

Explanation

The nucleolus is a named cell structure associated with producing ribosomal components inside the nucleus. The Golgi apparatus, peroxisome, and vesicle perform or support different cellular functions.

3. During mitosis, which organelles organize the mitotic spindle?

A. Centrioles

B. Peroxisomes

C. Ribosomes

D. Lysosomes

Answer: (A)

Explanation

Centrioles organize the mitotic spindle during mitosis. Ribosomes are involved in protein assembly, while lysosomes and peroxisomes have degradative and metabolic roles.

4. Which epithelial classification describes tissue with a single layer of cells?

A. Pseudostratified cartilage

B. Stratified epithelium

C. Simple epithelium

D. Dense regular tissue

Answer: (C)

Explanation

Simple epithelium consists of one cell layer. Stratified epithelium has multiple layers, while the other choices do not describe the relevant layer distinction.

5. Which tissue is included in the connective-tissue classification group?

A. Pseudostratified columnar epithelium

B. Stratified columnar epithelium

C. Simple cuboidal epithelium

D. Fibrocartilage

Answer: (D)

Explanation

Fibrocartilage is one of the listed connective tissues. The other choices are epithelial classifications rather than connective-tissue types.

6. What type of epithelium forms the epidermis?

A. Stratified squamous epithelium

B. Simple columnar epithelium

C. Dense irregular connective tissue

D. Simple squamous epithelium

Answer: (A)

Explanation

The epidermis is composed of stratified squamous epithelium. Dense irregular connective tissue forms the reticular dermis, not the epidermis.

7. Which transport process moves molecules through membrane proteins without directly using cellular energy?

A. Vesicular transport

B. Facilitated diffusion

C. Osmosis

D. Active transport

Answer: (B)

Explanation

Facilitated diffusion uses membrane proteins to move substances without direct energy expenditure. Active transport requires cellular energy, whereas vesicular transport uses membrane-bound vesicles and osmosis specifically concerns water movement.

8. Which long-bone region forms the shaft between the two ends of the bone?

A. Epiphyseal plate

B. Distal epiphysis

C. Diaphysis

D. Proximal epiphysis

Answer: (C)

Explanation

The diaphysis is the shaft of a long bone. The proximal and distal epiphyses are the two ends, while the epiphyseal plate is a growth-related structure.

9. Which structure is the growth region located between the epiphysis and diaphysis in a developing long bone?

A. Epiphyseal line

B. Articular cartilage

C. Medullary cavity

D. Epiphyseal plate

Answer: (D)

Explanation

The epiphyseal plate is the growth region of a developing long bone between the epiphysis and diaphysis. The epiphyseal line is a distinct listed structure, while the medullary cavity and articular cartilage have different anatomical locations and roles.

10. What is the functional unit of compact bone?

A. The lacuna

B. The canaliculus

C. The osteon

D. The lamella

Answer: (C)

Explanation

An osteon is the structural and functional unit of compact bone. A lacuna is not the unit; it is a space that contains an osteocyte.

11. What is the primary role of canaliculi in compact bone?

A. They house osteocytes within the layers of an osteon.

B. They form circular layers around the central canal.

C. They anchor compact bone to surrounding connective tissue.

D. They connect osteocytes with one another and with a blood supply.

Answer: (D)

Explanation

Canaliculi are narrow passages that allow osteocytes to connect with one another and receive access to a blood supply. Lacunae, rather than canaliculi, house osteocytes.

12. What are the circular layers that make up an osteon called?

A. Lacunae

B. Perforating canals

C. Canaliculi

D. Lamellae

Answer: (D)

Explanation

Osteons consist of several circular layers called lamellae. Lacunae are spaces for osteocytes, while canaliculi are connecting passages.

13. Which region is associated with the upper arm?

A. Carpal

B. Crural

C. Femoral

D. Brachial

Answer: (D)

Explanation

The brachial region refers to the upper arm. The crural region is associated with the leg, the carpal region with the wrist, and the femoral region with the thigh.

14. Which body system sends chemical messages through the bloodstream to target specific organs?

A. The endocrine system

B. The integumentary system

C. The urinary system

D. The nervous system

Answer: (A)

Explanation

The endocrine system releases chemical messages that travel through the bloodstream to target organs. The nervous system communicates through neural signaling rather than the bloodstream function described here.

15. A clinician identifies an organ that filters blood and produces urine. To which body system does this organ belong?

A. The endocrine system

B. The respiratory system

C. The urinary system

D. The integumentary system

Answer: (C)

Explanation

The kidneys are organs of the urinary system and help filter blood to produce urine. The lungs belong to the respiratory system and carry out gas exchange instead.

16. Which function is performed by the integumentary system?

A. Coordinating skeletal movement through nerve impulses

B. Regulating body temperature and limiting fluid loss

C. Transporting oxygen from the lungs to body tissues

D. Producing circulating blood cells in internal organs

Answer: (B)

Explanation

The integumentary system helps retain body fluids, protect against disease, eliminate waste, and regulate body temperature. Oxygen transport is a circulatory function, while nerve impulses coordinate signaling and movement.

17. Which sequence lists the epidermal strata from deepest to most superficial?

A. Stratum basale, stratum granulosum, stratum spinosum, stratum corneum, stratum lucidum

B. Stratum corneum, stratum lucidum, stratum granulosum, stratum spinosum, stratum basale

C. Stratum spinosum, stratum basale, stratum lucidum, stratum granulosum, stratum corneum

D. Stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, stratum corneum

Answer: (D)

Explanation

The epidermis progresses from deep to superficial through the stratum basale, spinosum, granulosum, lucidum, and corneum. The stratum basale is deepest, whereas the stratum corneum is most superficial.

18. Which skin structure produces goose bumps when it contracts?

A. The sudoriferous gland

B. The arrector pili muscle

C. The dermal papilla

D. The sebaceous gland

Answer: (B)

Explanation

Contraction of the arrector pili muscle raises the hair and produces goose bumps. Sebaceous and sudoriferous glands are glands with different roles in the skin.

19. Which structure is included among the named layers and structures of the skin?

A. The renal pelvis

B. The Pacinian corpuscle

C. The central canal

D. The bronchial tree

Answer: (B)

Explanation

The Pacinian corpuscle is one of the listed skin structures. The central canal belongs to compact bone, while the renal pelvis and bronchial tree are associated with other body systems.

20. Which bone forms the forehead and contributes to the roof of the eye sockets?

A. Frontal bone

B. Parietal bone

C. Temporal bone

D. Occipital bone

Answer: (A)

Explanation

The frontal bone forms the forehead and part of the orbital roof. The parietal bone contributes mainly to the cranial vault rather than the forehead and eye-socket roof.

21. Which landmark is a large opening in the occipital bone through which the spinal cord passes?

A. Optic canal

B. Foramen magnum

C. Mental foramen

D. External acoustic meatus

Answer: (B)

Explanation

The foramen magnum is the major opening in the occipital bone for the transition between the brainstem and spinal cord. The optic canal carries the optic nerve, while the other listed openings serve different anatomical regions.

22. Which serous membrane layer lines the wall of the abdominal cavity?

A. Pleural membrane

B. Parietal peritoneum

C. Pericardial membrane

D. Visceral peritoneum

Answer: (B)

Explanation

The parietal peritoneum lines the abdominal cavity wall. The visceral peritoneum covers abdominal organs, whereas pleural and pericardial membranes are associated with the thoracic cavity.

23. A structure contains most of the reproductive organs and lies inferior to the abdominal cavity; which cavity is it?

A. Vertebral cavity

B. Pelvic cavity

C. Thoracic cavity

D. Cranial cavity

Answer: (B)

Explanation

The pelvic cavity contains most of the reproductive organs. The thoracic cavity contains the heart and lungs, while the cranial and vertebral cavities house parts of the nervous system.

24. Which organ is part of the listed organ set and functions as the primary site of gas exchange?

A. Pancreas

B. Thyroid gland

C. Lungs

D. Gallbladder

Answer: (C)

Explanation

The lungs are included in the organ set and perform gas exchange between air and blood. The pancreas, gallbladder, and thyroid gland have digestive or endocrine roles rather than serving as the main gas-exchange organs.

25. Which anatomical plane divides the body into anterior and posterior portions?

A. Oblique plane

B. Coronal plane

C. Transverse plane

D. Sagittal plane

Answer: (B)

Explanation

The coronal plane divides the body into anterior and posterior portions. A sagittal plane divides left and right regions, while a transverse plane divides superior and inferior regions.