haen bio 256 exam 3

An increase in venous return most directly affects

stroke volume.

*Which indicates an EKG with junctional rhythm?

(a) i think

Which of the following chemicals does NOT control blood pressure?

nitric oxide

Angina pectoris is

pain accompanying myocardial ischemia.

If plasma proteins are lost due to kidney disease, then which of the following pressure changes occur as a result?

Blood colloid osmotic pressure decreases.

When a muscle fiber is stimulated by acetylcholine, ___ channels on the plasma membrane open.

Na+

Which is the correct sequence of events in a cardiac myocardium action potential?

Na+ inward flux, Ca++ inward flux, K+ outward flux

Which statement is true about an EKG?

The T wave indicates ventricular repolarization.

Fred's blood was determined to be AB positive. What does this mean?

There are no antibodies to A, to B, or to Rh antigens in his plasma.

___ binds Ca++, exposing ___ binding sites on ___.

Troponin, actin, myosin

Cardiac ischemia can result in

a myocardial infarction.

Muscle tone is

a state of sustained partial contraction of muscles.

Cancer of lymphoblasts developing quickly in a young child would be called

acute lymphocytic leukemia.

The second heart sound (dub of lub-dub) is caused by the

closure of the semilunar valves.

What causes the sounds heard in an artery when blood pressure is measured?

turbulence

Blood flow to a tissue increases if

vasodilation increases.

Skeletal muscle assists the heart in moving blood through

veins.

When red blood cells wear out, the iron of hemoglobin is saved and recycled. The remainder of the heme is

excreted as bile pigments (bilirubin).

Which of the following is a regulatory function of blood?

maintenance of normal pH in body tissues

A motor neuron and the myofibers it innervates is known as a(n)

motor unit.

Which of the following is a precursor of a basophil?

myeloblast

You obtain a tube of blood from a patient. EDTA anticoagulant is in the tube, so the blood does not clot. The tube is centrifuged and you remove the liquid from atop the cells. The liquid thus obtained is called

plasma.

Which of the following is NOT required for erythropoiesis?

production of vacuoles

Which takes the longest time in a contracting skeletal myofiber?

recovery

Glucose delivered to a recovering myofiber is used to

reestablish glycogen stores.

Where is the pacemaker of the heart located?

right atrium

An elaborate network of membranes in skeletal muscle cells that functions in calcium storage is the

sarcoplasmic reticulum.

During a normal cardiac cycle, the atria contract when they are directly stimulated by the

sinoatrial node.

Which of the following factors does NOT influence heart rate?

skin color

Red blood cells do not consume any of the oxygen they transport because they

do not have mitochondria.

All of the following can be expected with polycythemia except

low blood viscosity.

Select the correct statement about factors that influence blood pressure.

Excess red cell production would cause a blood pressure increase.

Normal cardiac output is about ________ L/min.

5.2

To lift a 50 lb barbell, you use an ___ contraction; to hold it above your head you use an ___ contraction.

Isotonic, isometric

The normal lymphocyte percentage of white blood cells is

about 25%

The neurotransmitter used at a motor end plate is

acetylcholine.

Which will increase blood pressure?

antidiuretic hormone

Which provides a long-term control for blood pressure?

blood volume

The dicrotic notch refers to the

brief rise in aortic pressure caused by backflow of blood rebounding off the aortic semilunar valve.

Which of the following is not one of the three main factors influencing blood pressure?

emotional state

Which of the following surrounds the individual muscle cell?

endomysium

In skeletal muscle, each myofiber is surrounded by

endomysium.

When cardiac muscle cells die the result is

fibrosis (scarring).

Blood pressure peaks each day (assuming awakening in the morning, and going to sleep at night)

in the morning.

If the vagus nerve to the heart were cut, the result would be

the heart rate would increase by about 25 beats per minute.