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When the temperature of the outside air exceeds their internal body temperature, jackrabbits living in hot, arid lands will

constrict the blood vessels in their large ears to reduce transfer of external heat to the blood in their ears.

If thermoregulation is considered to be a secondary function of the large ears of jackrabbits, then the primary function of the ears is

to detect predators by using the large size and flexible positioning of the external ears to channel sound waves into the ear canal.

Which choice best describes a reasonable mechanism for animal structures becoming better suited over evolutionary time to specific functions?

Animals with mutations that give rise to effective structures will become more abundant.

Penguins, seals, and tuna have body forms that permit rapid swimming, because

the shape is a convergent evolutionary solution to the need to reduce drag while swimming.

Evolutionary adaptations that help diverse animals directly exchange matter between cells and the environment include

an external respiratory surface, a small body size, and a two-cell-layered body.

The similar fusiform body shape of diverse animals, such as sharks, penguins, and aquatic mammals, has evolved because

this is the body shape that makes it possible for aquatic animals to swim rapidly.

The specialized structures of complex animals have evolved because

they permit adjustments to a wide range of environmental changes.

All animals, whether large or small, have

each living cell in contact with an aqueous medium.

As body size increases in animals,

there is a decrease in the surface-to-volume ratio.

To increase the effectiveness of exchange surfaces lining the lungs and the intestines, evolutionary pressures have

increased the exchange surface area with folds and branches.

The specialized function shared by the cells that line the lungs and those that line the lumen of the gut is that both types of cells

provide abundant exchange surface.

Interstitial fluid is

the route for the exchange of materials between blood and body cells.

Multicellular organisms must keep their cells awash in an "internal pond" because

an aqueous medium is needed for the cellular exchange of nutrients, gases, and wastes.

Tissues are composed of cells, and tissues functioning together make up

organs.

An exchange surface in direct contact with the external environment is found in the

lungs.

Of the following choices, the epithelium with the shortest diffusion distance is

simple squamous epithelium.

The absorptive epithelia in the gut are considered "polarized" because

The absorptive epithelia in the gut are considered "polarized" because

Most of the exchange surfaces of multicellular animals are lined with

epithelial tissue.

An example of a connective tissue is the

An example of a connective tissue is the

Stratified cuboidal epithelium is composed of

several layers of boxlike cells.

Coordinating body functions via chemical signals is accomplished by

the endocrine system.

Connective tissues typically have

) relatively few cells and a large amount of extracellular matrix.

The fibers responsible for the elastic resistance properties of tendons are

collagenous fibers.

If you gently twist your earlobe, it does not remain distorted because it contains

elastin fibers.

The nourishment, insulation, and support for neurons is the result of activity by the

glial cells.

Fibroblasts secrete

proteins for connective fibers.

Breathing is accomplished via the rhythmic contraction and relaxation of

skeletal muscle.

Blood is best classified as connective tissue because

its cells are separated from each other by an extracellular matrix.

Muscles are joined to bones by

tendons.

Most types of communication between cells utilize

the release of chemical signals by the cell sending the message.

With its abundance of collagenous fibers, cartilage is an example of

connective tissue.

A matrix of connective tissue is apparent in

chondroitin sulfate of cartilage.

In a typical nerve cell, the nucleus is found in the

cell body.

All types of muscle tissue have

interactions between actin and myosin.

All skeletal muscle fibers are both

) striated and under voluntary control.

Cardiac muscle cells are both

striated and interconnected by intercalated disks.

The type of muscle tissue surrounding internal organs, other than the heart, is

smooth muscle.

Food moves along the digestive tract as the result of contractions by

smooth muscle.

The cells lining the air sacs in the lungs make up a

simple squamous epithelium.

The body's automatic tendency to maintain a constant and optimal internal environment is termed

homeostasis.

An example of a properly functioning homeostatic control system is seen when

the kidneys excrete salt into the urine when dietary salt levels rise.

An example of effectors' roles in homeostatic responses is observable when

an increase in body temperature results from involuntary shivering.

Positive feedback has occurred when

uterine contractions needed for the birthing process are expedited by the pressure of a moving baby in its mother's uterus.

Positive feedback differs from negative feedback in that

the positive feedback's effector responses are in the same direction as the initiating stimulus rather than opposite to it.

To prepare flight muscles for use on a cool morning, hawkmouth moths

rapidly contract and relax these muscles to generate metabolic warmth.

In a survivably cold environment, an ectotherm is more likely to survive an extended period of food deprivation than would an equally sized endotherm because the ectotherm

) invests little energy in temperature regulation.

Humans can lose, but cannot gain, heat through the process of

evaporation.

An example of an ectothermic organism that has few or no behavioral options when it comes to its ability to adjust its body temperature is a

sea star, a marine invertebrate.

An overheated and sick dog in a hot environment will have an impaired thermoregulatory response when its

body temperature increases to match the environmental temperature.

Endothermy

is a characteristic of animals that have a fairly constant body temperature.

panting responses that are observed in overheated birds and mammals dissipates excess heat by

evaporation.

An example of an organism that has only behavioral controls over its body temperature is the

green frog.

Most land-dwelling invertebrates and all of the amphibians

are ectothermic organisms with variable body temperatures.

The temperature-regulating center of vertebrate animals is located in the

hypothalamus.

A female Burmese python incubating her eggs can warm them using

shivering thermogenesis.

) In mammals this response is known as fever, but it is known to raise body temperature in other bacterially infected animals, including lizards, fishes, and cockroaches.

a change in the body's thermostat "set point"

Ingested foods inside the digestive tract of snakes are typically digested by

enzymatic hydrolysis.

Seasonal changes in snake activity are due to the fact that the snake

) is more active in summer because it can gain body heat by conduction.

Standard metabolic rate (SMR) and basal metabolic rate (BMR) are

both measured in animals in a resting and fasting state.

For adult human females, the metabolic "costs" of pregnancy and lactation are

5-8% more than when she was nonpregnant.

Among these choices, the least reliable indicator of an animal's metabolic rate is the amount of

water consumed in one day.

During its months-long hibernation in its burrow, the body temperature of a ground squirrel

varies between 5°C and 37°C, depending on the frequency of arousals from hibernation.

Winter acclimatization" in cold-zone mammals can include

hibernation for several weeks.

Hibernation and estivation during seasons of environmental stress are both examples of

torpor.

Panting by an overheated dog achieves cooling by

evaporation.

Catabolism of specialized brown fat depots in certain animals is substantially increased during

nonshivering thermogenesis.

A moth preparing for flight on a cold morning warms its flight muscles via

shivering thermogenesis.

(Picture 6)The thin horizontal arrows in the figure above show that

the warmer arterial blood transfers heat to the cooler venous blood.

(Picture 6)Examine the figure above. Near a goose's abdomen, the countercurrent arrangement of the arterial and venous blood vessels causes

the temperature difference between the contents of the two sets of vessels to be minimized.

Imagine that you are a biologist who is attempting to get an accurate measure of an animal's basal metabolic rate. The best time to measure the metabolic rate is when the animal

is resting and has not eaten its first meal of the day.

The body tissue that consists largely of material located outside of cells is

connective tissue.

Which of the following would increase the rate of heat exchange between an animal and its environment?

wind blowing across the body surface

Consider the energy budgets for a human, an elephant, a penguin, a mouse, and a snake. The ________ would have the highest total annual energy expenditure, and the ________ would have the highest energy expenditure per unit mass.

elephant; mouse

Compared with a smaller cell, a larger cell of the same shape has

less surface area per unit of volume.

An animal's inputs of energy and materials would exceed its outputs

if it is growing and increasing its mass.

You are studying a large tropical reptile that has a high and relatively stable body temperature. How would you determine whether this animal is an endotherm or an ectotherm?

You subject this reptile to various temperatures in the lab and find that its body temperature and metabolic rate change with the ambient temperature. You conclude that it is an ectotherm.

Which of the following animals uses the largest percentage of its energy budget for homeostatic regulation?

a desert bird

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