Bio 169 Lab Practical #1 Frear Flashcards
Homoeotherms
elevate their body temperature and maintain it within a defined range
Thyroid Releasing Hormone is secreted by
neurosecretory cells in the hypothalamus
T3 and T4 are
hydrophobic and stored in the extracellular thyroglobulin
Thyroid Releasing Hormone is released into the blood and directly affects cells
in the anterior pituitary gland
The body's thermostat is located in the
hypothalamus
Why did the mouse exhibit a higher metabolic rate as the temperature was decreased below 18 degrees Celcius?
the mouse shivered while being exposed to the extreme cold temperature
What is the effect of moderate cooling on the rate of oxygen consumption?
the rate of oxygen consumption increased
As the temperature was ______________ the metabolic rate __________ due to ___________________________ .
decreased, increased, increased activity of the thyroid gland
The amount of hemoglobin that binds to oxygen is dependent upon
pH level, oxygen level, temperature (all of the above)
The partial pressure of oxygen is
the portion of the barometric pressure produced by oxygen
Which of the following would increase the relative acidity of the blood?
pH change from 7 to 3; pH change 14 to 7 (Both A and C)
A right shift in the oxygen dissociation curve would occur as the blood _________ _______________ .
pH, decreased
At partial pressure of oxygen of 50 mmHg, a lower pH would result in
increased release of oxygen from Hemoglobin
At partial pressure of oxygen of 50 mmHg, a decrease in DPG would result in
decreased release of oxygen from Hemoglobin
Red Blood Cells
make ATP through glycolysis
2,3 Diphosphoglycerate is a molecule that
is a byproduct of ATP production within the Red Blood Cell; increases in concentration as the Partial Pressure of Oxygen decreases (both B and C are correct)
A right shift in the oxygen dissociation curve would occur as the blood _________ _______________ .
DPG levels increase
The ECG measures
action potentials in the atria ventricles
You are measuring the impact of exercise on the ECG of an individual. You notice that the T - P interval is reduced as the person exercises. The T - P interval is located _________ and from this observation you can determine that___________________
between adjacent ECGs as T corresponds to the repolarization of the ventricles; the duration of blood flow to the coronary arteries is decreased between cardiac cycles
You are measuring the impact of exercise on the ECG of an individual. You notice that the P - R interval does not change as the person exercises. From this observation you can determine that
exercise has no impact on the atrial action potential
The lub sound is created when _________________ while the dub sound is created when ____________________ .
AV valves close, Semi lunar valves close
The lub sound corresponds to _________________, while the dub sound corresponds to ____________________________ .
QRS complex, T wave
When blood flows from the ventricle into the aorta, the blood pressure in the aorta
increases and is called the systolic pressure
On the left side of the heart, the semilunar valves open when
the blood pressure in the left ventricle is greater than the blood pressure in the aorta
In the relaxed heart the blood pressure in the aorta is
greater than the blood pressure in the left ventricle
The axis of the heart points
out the left side of the body
Cooling the fingers results in which of the following?
decrease in peripheral blood flow
Which of the following correct describes blood pressure in the systemic arteries?
changes due to the cardiac cycle activity
As the hand is elevated a persons blood flow in the fingers of that hand would ______________ .
decrease
A decrease in arterial blood pressure would stimulate ___________________ activity, which would ______________ .
sympathetic, increase stroke volume
Which of the following reflect the systolic blood pressure in a person standing up? Laying down?
Standing = 116, Laying down = 86
Which cells use ameoboid movement to propel themselves through body fluids to remove 'non-self' matter?
macrophages, neutrophils, mast cells (all of the above)
Which of the following statements is correct?
A phagocytic cell engulfs a bacteria. The lysosome contains enzymes that digest the bacteria.
Which of the following is used to draw immune cells to an injured area?
calcium, interleukins, plasma proteins (all of the above)
A macrophage that has placed a piece of viral protein on its cell surface is called _________________________
Antigen presenting cell
B cell activation results in the formation of ____________________ which release ________________ .
plasma cells, antibodies
spleen
Identify the structure located at the tip of the arrow.
thymus
Identify the structure located at the tip of the arrow.
A balloon is attached to the end of straw that fits inside a wash bottle. What happens to the balloon when the wash bottle is squeezed?
the balloon inflates
What impact does exercise have on Peak Expiratory Flow rate?
exercise decreases PEF
When a person inhales the pressure inside the thorax is ____________ the atmospheric pressure.
less than
Diffusion at the respiratory membrane is facilitated by;
deoxygenated blood in the pulmonary arteries, a thin exchange barrier, a large surface area (all of the above)
Blood flow to a group of alveoli will increase if
the level of oxygen in the alveoli increases
Knowing the impact that gravity has on the pressure of a fluid - what area would have the lowest blood pressure in a person who is standing upright?
at the apex of the lung
The anatomical dead space is the
volume of air in the conducting airways
Which of the following is a correct statement about exercise?
Exercise increases the tidal volume while having no impact on the vital capacity.
During exercise the body meets the demand for increased oxygen by
both increasing tidal volume and breathing rate
Volume of the thoracic cavity is _____________ by contraction of _________________ .
increased, diaphragm and external intercostal muscles
An increase in tidal volume will ______________ , while an increase in breathing rate will ____________________ .
increase amount of fresh air entering the alveoli, increase the alveolar ventilatio