2011 physiology Flashcards
What is the method of regulation of oxytocin concentration?
a. Positive feedback
b. Negative feedback
a. Positive feedback
What is the function of myosin I?
Attaches the membrane to the cytoskeleton
What is the role of microtubule-associated proteins?
Transport of vesicles to the nucleus
another exam has a different answer!
How is calcium transported from the lumen of the endoplasmic reticulum to the cytoplasm?
Passive diffusion
Why do vascular smooth muscle cells experience no fatigue?
Because of slow cross-bridge cycling
What stabilizes unbound steroid receptors in the cytoplasm?
Heat-shock proteins
What results in the repolarization of the membrane?
Efflux of positive ions and influx of negative ions
What is responsible for the depolarization phase in nerve cells?
Na+ influx through gated channels
pH: 7.3 (7.35-7.45)
CO2: 47 (35-45)
HCO3-: 27 (22-26)
What acid-base disorder does the patient have?
Respiratory acidosis
A man has a body-fat percentage of 31%. What can you conclude from this?
a. He is healthy
b. He is obese
c. He is underweight
b. He is obese
Which of the following initiates exocytosis?
Binding of v-snare to t-snare
What is the center of thermoregulation in the body?
Hypothalamus
In a state of tetani, which ion exhibits excess release in muscle cells?
Ca2+
Where are desmosomes found in high concentrations?
Skin
A cell releases a messenger that diffuses and acts upon a nearby cell without going to the circulation. What is this called?
Paracrine
A sample of tissue was left to dry out. After a few hours, the sample’s weight dropped from 100g to 90g. What type is this tissue?
Adipose
Which of the following occurs during an event of hypertonic expansion?
ICF osmolarity increases
According to the starling equilibrium, what is responsible for removing the excess fluid from ISF space back to the circulation?
Lymphatic drainage
Which of the following cells exhibit unstable depolarization?
GI smooth muscle cells
The cell creates a gradient of substance X by driving it against its concentration gradient. Substance Y uses the gradient of X to gain entry into the cell. What type of transport is this?
Secondary active transport
Which hormone is responsible for milk production?
Prolactin
Which of the following is true regarding the disposal of ammonia in the body?
It is first converted to urea by the liver and then filtered by the kidneys
Damage to which part of the brain results in loss of the working memory?
Prefrontal cortex
