Cuestionario: Animal Tissues — 19 preguntas

1. Which tissue forms protective outer layers and lines structures such as blood vessels, alveoli, and kidney tubes?

A. Connective tissue

B. Nervous tissue

C. Muscular tissue

D. Epithelial tissue

Answer: (D)

Explicación

Epithelial tissue covers external surfaces and lines many internal structures, including blood vessels, alveoli, and kidney tubes. Connective tissue primarily binds and supports structures.

2. Which characteristic makes squamous epithelium well suited for gas exchange?

A. Its thin, flat, semipermeable cells

B. Its multiple layers of cuboidal cells

C. Its elongated cells specialized for secretion

D. Its rigid cells embedded in a mineral matrix

Answer: (A)

Explicación

Squamous epithelium consists of thin, flat, semipermeable cells, allowing efficient gas exchange. Multiple layers characterize stratified squamous epithelium instead.

3. Which epithelial tissue forms the skin and consists of multiple layers of squamous cells?

A. Simple squamous epithelium

B. Stratified squamous epithelium

C. Cuboidal epithelium

D. Columnar epithelium

Answer: (B)

Explicación

Stratified squamous epithelium is made of multiple layers of squamous epithelial cells and forms the skin. Simple squamous epithelium is thin and single-layered.

4. A section of intestine is specialized for absorption and secretion. Which epithelial tissue would most likely line it?

A. Squamous epithelium

B. Columnar epithelium

C. Cuboidal epithelium

D. Stratified squamous epithelium

Answer: (B)

Explicación

Columnar epithelium has elongated, pillar-like cells and lines organs involved in absorption and secretion, including the intestine.

5. What distinguishes connective tissue from tissues that primarily cover surfaces?

A. It consists of tightly packed cells with little surrounding material

B. It contains scattered cells embedded in an abundant matrix

C. It is formed exclusively from elongated contractile cells

D. It contains layers of flat cells exposed to the environment

Answer: (B)

Explicación

Connective tissue contains scattered living cells embedded in an abundant matrix, which enables it to connect, bind, pack, and support body structures. Epithelial tissue mainly covers and lines surfaces.

6. Which set lists the major functions of connective tissue?

A. Contracting, moving, and generating heat

B. Binding, supporting, and packing structures

C. Receiving, processing, and transmitting signals

D. Covering, lining, and absorbing substances

Answer: (B)

Explicación

The major functions of connective tissue are binding structures, supporting structures, and packing materials.

7. What type of tissue is blood, and how does it circulate?

A. A muscular tissue that moves through vessels by its own contraction

B. A fluid connective tissue that flows through vessels due to heart activity

C. An epithelial tissue that spreads across vessel walls

D. A rigid tissue that circulates through vessels during breathing

Answer: (B)

Explicación

Blood is a fluid connective tissue that flows inside blood vessels as a result of the heart's pumping activity.

8. What proportion of blood is plasma compared with blood cells?

A. 55% plasma and 45% blood cells

B. 70% plasma and 30% blood cells

C. 45% plasma and 55% blood cells

D. 30% plasma and 70% blood cells

Answer: (A)

Explicación

Blood consists of 55% fluid plasma and 45% blood cells.

9. What gives bone its rigid and non-flexible character?

A. A soft matrix composed mainly of stored fat

B. A hard matrix containing calcium and phosphorus compounds

C. A fluid matrix that circulates through vessels

D. An elastic matrix containing loosely arranged fibers

Answer: (B)

Explicación

Bone cells are embedded in a hard matrix composed of calcium and phosphorus compounds, making bone rigid and non-flexible. Ligaments, in contrast, are elastic.

10. Which statement best describes the roles of bones in the body?

A. They form the endoskeleton, support soft parts, and protect organs

B. They line organs, absorb nutrients, and secrete substances

C. They connect bones, permit joint rotation, and absorb impact

D. They store fat, cushion organs, and provide body shape

Answer: (A)

Explicación

Bones form the endoskeleton, support soft body parts, and protect delicate tissues and organs. Ligaments connect bones, while adipose tissue stores fat and cushions organs.

11. Why can a ligament permit bending and rotation at a joint?

A. It is fluid and moves through blood vessels

B. It is multilayered and covers the skin

C. It is elastic and binds one bone to another

D. It is rigid and contains mineral salts

Answer: (C)

Explicación

A ligament binds one bone to another and allows joint bending and rotation because it is highly elastic.

12. What is the defining function of muscular tissue?

A. Coordinating learned behavior and memory

B. Transmitting impulses through specialized cells

C. Producing contraction through contractile proteins

D. Forming protective layers around internal organs

Answer: (C)

Explicación

Muscular tissue is contractile because its cells contain contractile proteins that produce contraction. Nervous tissue, by contrast, specializes in transmitting impulses.

13. Which description best identifies a striated muscle fibre?

A. A branched, striated cell that works without fatigue

B. A short, irregular cell specialized for impulse transmission

C. A spindle-shaped, non-striated cell under involuntary control

D. A long, cylindrical, unbranched cell under voluntary control

Answer: (D)

Explicación

Striated muscle fibres are long, cylindrical, unbranched cells with alternating light and dark bands, and they function under voluntary control.

14. Which feature distinguishes smooth muscle fibres from striated muscle fibres?

A. Smooth fibres are cylindrical and voluntarily controlled

B. Smooth fibres contain alternating light and dark bands

C. Smooth fibres are branched and rhythmically beating

D. Smooth fibres are spindle-shaped and non-striated

Answer: (D)

Explicación

Smooth muscle fibres are spindle-shaped, unbranched, non-striated, and involuntary. Their structure differs from the long, cylindrical, striated form of striated muscle fibres.

15. Why can cardiac muscle maintain the heart’s pumping activity throughout life?

A. Its fibres beat continuously and rhythmically without fatigue

B. Its fibres contract voluntarily when movement is needed

C. Its fibres are non-striated and remain permanently relaxed

D. Its fibres transmit impulses instead of producing contraction

Answer: (A)

Explicación

Cardiac muscle fibres produce the heart’s pumping activity through contraction and relaxation, and they beat continuously and rhythmically without fatigue.

16. What is the primary function of nervous tissue?

A. Secreting hormones into the bloodstream

B. Producing movement through contraction

C. Storing minerals in connective tissue

D. Transmitting stimuli and impulses

Answer: (D)

Explicación

Nervous tissue transmits stimuli and impulses and, together with connective tissue cells, forms the brain, spinal cord, and nerves. Muscle tissue, rather than nervous tissue, produces movement through contraction.

17. Which arrangement of processes correctly describes a neuron?

A. One nucleus, many muscle fibres, and no cell processes

B. One short axon and many branched cell bodies

C. Many long axons and one short dendrite

D. One cell body, many short dendrites, and one long axon

Answer: (D)

Explicación

A neuron has a cell body, many short dendrites, and one long axon. Some neurons can reach up to a metre in length.

18. If an impulse is picked up by a dendrite, in which direction does it normally travel first?

A. Into connective tissue surrounding the neuron

B. Toward the cyton through the dendrite

C. Toward another dendrite without passing the cell body

D. Away from the cell body along the axon

Answer: (B)

Explicación

Dendrites pick up impulses and transmit them toward the cyton, whereas the axon carries impulses away from the cell body.

19. Which combination best describes the roles of the nervous system?

A. It forms bones and stores calcium for movement

B. It digests food and absorbs nutrients exclusively

C. It contracts muscles and circulates blood directly

D. It responds to stimuli and coordinates body activities

Answer: (D)

Explicación

The nervous system responds to stimuli, controls and coordinates body activities, and supports learned behavior, intelligence, memory, and reasoning.