Chapter 6 - Physiology Flashcards

1
Q

What are some examples of adaptations associated with feeding and digestion?

A
  • tongue anatomy
  • gizzard anatomy
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2
Q

Describe how gizzard anatomy differs?

A

Gizzards range from large, seed-crushing structures to softer bags of tissue in fish eaters to nearly-absent pouches in the Hoatzin.

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3
Q

The Hoatzin feeds entirely on…

A

Leafy vegatations

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4
Q

The digestive system of Hoatzin functions much like…

A

Ruminants (cow)

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5
Q

The Hoatzin is a ______ fermenter.

A

foregut

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6
Q

The crop of the Hoatzin is ______. (enlarged or shrunk)

A

enlarged

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7
Q

How many fermation chambers are in the crop of Hoatzin?

A

two

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8
Q

Describe the fermation chambers of Hoatzin.

A

chambers house bacteria that break down indigestible cellulose into digestible carbohydrates

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9
Q

The food of the Hoatzin is further fermented in the ____ ____.

A

lower esophagus

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10
Q

For the Hoatzin, both the ____ and _____ are muscular and will grind the mash
of leaves inside

A

crop, esophagus

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11
Q

In Hoatzin, the ______ and ____ are reduced in size and function.

A

proventriculus, gizzard

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12
Q

Why are Hoatzin poor flyers?

A

The keel is much reduced in size to accommodate the enlarged crop

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13
Q

_____ is produced by the kidneys and mixes with feces in the _____ ____.

A

Urine, lower intestine

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14
Q

Where is water absorbed?

A

Lower intestine

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15
Q

Birds excrete nitrogenous waste in the form of _____ _____, which forms ______ ____.

A

uric acid, white crystals

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16
Q

To excrete urea, mammals require ____-____ times the amounnt of water to excrete urea compared to birds.

17
Q

What are salt glands?

A

Organs that remove excess salt from the blood to excrete from the body.

18
Q

Are birds endothermic or exothermic?

A

Endothermic

19
Q

Most birds keep their body temperature at about

A

40C or 104 F

20
Q

Birds do not have a diaphragm, which drives respiration in mammals. Instead, birds inhale by

A

lowering the sternum to enlarge the chest cavity and expand the air sacs

21
Q

Avian hearts are ____ larger than mammalian hearts

22
Q

Resting heart rates in medium-sized birds average about

23
Q

What is BMR?

A

Basal metabolic rate, the rate of metabolism when an organism is at rest

24
Q

While most birds do not hibernate, what bird does?

A

the Common Poorwill of western US

25
Describe Bergmann's Rule
Individuals tend to be smaller in hot, humid climates and larger in dry, cold climates
26
An expanded section of the esophagus. Used to store and soften food
crop
27
First part of the stomach, chemical digestion, most developed in fish eating birds and raptors
Proventriculus
28
Second part of the stomach, mechanical digestion, most developed in seed-eaters
Gizzard
29
pouches near the terminus of the digestive tract. Contain bacteria to break down plant material
Ceca (singular Cecum)