Exam 1 - Intro, Nutrition, Gas Exchange, & Osmoregulation Flashcards Preview

Biology 1620 > Exam 1 - Intro, Nutrition, Gas Exchange, & Osmoregulation > Flashcards

Flashcards in Exam 1 - Intro, Nutrition, Gas Exchange, & Osmoregulation Deck (30):
1

Which of the following is true concerning positive feedback pathways?

When present, they must have a mechanism for self-termination

2

The three general components in a negative feedback loop are the

sensor - integrator - effector

3

Which of the following is NOT an appropriate response to having a decreased body temperature?

more blood is diverted (directed) to the skin

4

Which of the following hormones would decrease immediately following a meal?

ghrelin

5

Most ulcers are caused by

bacteria

6

Which of the following is true about an individual suffering from Kwashiorkor?

they lack protein in the diet

7

Where do proteins begin to be enzymatically broken down?

stomach

8

Based upon discussions in lecture, which vitamin would be least likely to cause a problem if over consumed?

vitamin C

9

Generally speaking, the more plant products a species eats, the larger one would expect their ________ to be.

cecum

10

You are hiking outside of Jackson Hole, WY and spot a thin coyote (a carnivore) eating fruit dropped from a nearby tree. This is an example of:

opportunistic feeding

11

Constipation is generally a problem involving function of which structure in the digestive system?

colon

12

Lacteals play a key role in the absorption of

fats

13

Which of the following is an example of countercurrent exchange?

the flow of water across the gills of a fish and that of blood within those gills

14

The pulmonary arteries deliver blood directly into the

lungs

15

Stenosis is a physiological problem concerning which structure?

heart valves

16

During which phase of the ECG (electrocardiogram) does ventricular repolarization occur?

T wave

17

In the lungs at the site of gas exchange, the PO2 is 104 mm Hg and PCO2 is 40 mm Hg. Based upon these numbers, what is the approximate concentration of these two gases that would be found in the left atrium? Best answer, please.

PO2 = 104 mm Hg; PCO2 = 40 mm Hg

18

Which animal does NOT have a problem with residual volume?

BIRDS

19

Where can the pacemaker cells that determine the respiration rate be found?

in the medulla oblongata

20

Which of the following is true about the function of respiratory pigments?

they help increase the solubility of O2 in the blood

21

The graph below is known as the oxyhemoglobin dissociation curve. Which of the following statements is NOT true concerning this graph?
(It wont let me upload the pic but it looks like the first quarter of this ~)

as cells become more active and PO2 drops, O2 binds more tightly to hemoglobin

22

The figure shows four graphs of PRESSURE versus DISTANCE across the capillary beds. Which one is considered 'normal'?

blood pressure goes like \ and is intersected in the middle by osmotic pressure

23

Which organism has a special adaptation for living in a marine environment that includes maintaining its tissues hyperosmolar to sea water?

shark

24

After the Loop of Henle, where does the filtrate go next?

distal tubule

25

For the graph shown, which line would BEST represent a euryhaline, osmoregulator?

line goes /---/ ish

26

By definition, an osmoconformer always lives in fresh water.

False

27

in which structure does the majority of nutrient reabsorption occur?

the proximal tubule

28

diagram is a container with a semipermeable membrane splitting it with 6 particles in side A and 4 on side B. Which side is hyperosmotic an where will the water move?

Side A is hyperosmotic and water will move towards side B

29

A fish living in freshwater tends to do which of the following?

drink little; urinate a lot

30

According to lecture, which area in the juxtamedullary nephron is most involved in helping to establish the hyperosmotic environment of the renal medulla?

ascending limb of the Loop of Henle