Which of the following has (have) both endocrine and exocrine activity?
the pancreas
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
Interstitial fluid
the route for the exchange of materials between blood and bloody cells
Tissues are composed of cells, and tissues functioning together make up
organs
An exchange surface is direct contact with the external environment is found in the
lungs
The absorptive epithelia in the gut are considered "polarized" because
the structures on the apical surface are different than those on the basal surface
An example of connective tissue is the
blood
Connective tissues typically have
relatively few cells and a large amount of extracellular matrix
If you gently twist your earlobe, it does not remain distorted because it contains
elastic fibers
The nourishment, insulation, and support for neurons is the result of activity by the
glial cells
Fibroblasts secrete
proteins for connective fibers
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
With its abundance to collagenous fibers, cartilage is an example of
connective tissue
All types of muscle tissue have
interactions between actin and myosin
All skeletal muscle fibers are both
striated and under voluntary control
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 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
In a survivably cold environment, an ectotherm is most 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 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
The thermoregulatory response of an overheated dog in a very hot environment is impaired if the response causes
body temperature to increase to match the environmental temperature.
The 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
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.
Panting by an overheated dog achieves cooling by
evaporation
Animals that migrate great distances would obtain the greatest energetic benefit of storing chemical energy as
fats