Which ONE of the following is INCORRECT regarding the mechanism by which the sub

Question

Which ONE of the following is INCORRECT regarding the mechanism by which the substance moves across the wall of a capillary? Select one: Respiratory gases permeate rapidly, because they are lipid soluble. Urea diffuses across the wall down its concentration gradient. Net water transport depends upon net (hydraulic) filtration pressure. Glucose is carried across the wall by plasma filtration. Oxygen permeation is more than 1000 times faster than glucose permeation. Cardiac stroke volume may be defined as Select one: pre-load minus after load end-systolic volume (ESV) minus end-diastolic volume (EDV) peak ejection pressure minus diastolic pressure after load minus pre-load end-diastolic volume (EDV) minus end-systolic volume (ESV) Which ONE of the following statements regarding blood vessels is INCORRECT? Select one: Arterioles are sometimes called resistance vessels. Veins are sometimes called capacitance vessels. Capillaries contain smooth muscle in their walls Arterioles contain smooth muscle in their walls. Arteries contain large amounts of elastic tissue in their walls. Key mechanisms in combating orthostatic or postural hypotension include: Select one: muscle pumps. The baroreceptor reflex. All of the above. None of the above. Reduced distensibility of leg veins compared to thoracic veins. In cardiac muscle, the action potential in the ventricles: Select one: has an unstable resting membrane potential. Is due to an increase in chloride permeability. Has a resting membrane potential of about -60 mV. Is shorter than the action potential of a pace market cell. Relies on an increase in calcium permeability. The major mechanism(s) controlling the diameter of arteries in the skeletal muscle is Select one: extracellular K^+ concentration all of the above extracellular CO_2 concentration myogenic mechanisms accumulation of metabolic waste products

Explanation / Answer

Answer= the INCORRECT statement about the mechanism by which substances moves across the wall of a capillary is

Glucose is carried across the wall by plasma filteration

explaination = transcapillary glucose transport is by diffusion down a concentration gradient

INCORRECT OPTIONS ARE=

1]respiratory gases permeate rapidly because they are lipid soluble

the thin wall of a capillary are composed of a single layer of endothelial cells

hence respiratory gases such as CO2 & O2 diffuse through cuch capillaries as like lipid soluble molecules

2] urea diffuses across the wall down its concentration gradient

Answer=Cardiac stroke volume may be defined as

End diastolic volume (EDV) minus end systolic volume (ESV)

cardiac stroke volume is the volume of blood pumped from the left ventricle per beat

is calculated using measurements of ventricular volume from an echocardiograms & sustracting the blood in the ventricle at the end of a beat (end systolic volume ) from the volume of blood just prior to the beat (called as end diastolic volume)

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