Question

Why is there not a resting membrane potential in autorhythmic cells? A) The Cat+ channels open too early B) The Kt channels are not finished closing when the Cat+ channels open C) The lf channels are open when repolarization ends D) The lf channels are not open when depolarization begins Which cells secrete renin in response to low blood pressure? A) granular cells C) myogenic cells B) macula densa cells D) tubulorenal cells What is the MAIN reason intercalated disks are vital to the cardiac muscle contraction process? A) decreased osmotic pressure inside cells C) electrical barrier between cells B) dense bodies holding the filaments tight D) ion flow between cells Which of the following 02 transport methods is responsible for initiating the rapid diffusion of 02 out of the red blood cell at the tissue level (in other words, which happens first)? A) HC03 reconverted to C02 and H20 C) 02 binds to hemoglobin B) 02 dissociates from hemoglobin D) plasma 02 diffuses out

Answer 1

Question 1

Correct answer: option b

Rational:

1. Resting membrane potential in auto rhythmic cells,

Pottassium channel when not finishing to close and ca++ channel opens.

Question 2;

Correct answer: a

Rational:

Granular cells secrets renin.

So option a is correct.

Other cells are not involved in renin secretion.

Question3:

Correct answer: option b

Rational:

Intercalated disc is vitamins in cardigan contraction due its dense body holding filaments tight.

Other options are incorrect.

Question 4

Correct answer: option B

Rational

Oxygen dissociation with haemoglobin's is fastest way of transportation of oxygen.

Other options are incorrect.