chapter 8 bio

Medium - and large-size vessels maintain a partial state of muscle contraction, resulting in high intravessel pressure

arteries

When blood leaves the heart, it first enters

arteries

Atrioventricular (AV) valves prevent blood from flowing backward into the

atria

The sinoatrial node

regualtes heart beat

Which vein(s) carry oxygenated blood

right and left pulmanry

. this blood vessel transports blood from the heart to capillaries

artery

The inner walls are lined with endothelium to create a smooth, low-friction surface.

artery and vein

? carry blood away from the heart and ? carry blood toward the heart

Arteries; vein

The heart muscle itself receives oxygen and nutrients from blood transported by the ________ arteries

coronary

Vasodilation of arterioles __________ their diameter, __________ blood flow to the capillaries

increases; increasing

The movement of blood through the pulmonary circuit transports

oxygenated blood from the lungs to the heart

The protective sac that encases the heart and anchors it to surrounding structures is the

pericardium

All of the following are part of the cardiac conduction system, EXCEPT

the chordae tendineae

In which one of the following blood vessels is blood under the lowest pressure?

vein

Skeletal muscle pump aid blood

vein

This blood vessel transports blood from the capillaries to heart

vein

Which one of the following is TRUE regarding the lymphatic system

The lymphatic system removes microorganisms from body fluid.

This blood vessel permits exchange of nutrients and gases between blood and tissues.

capillary

Which blood vessel is best suited for exchange of gases and nutrients with the surrounding tissue

capillary

Fluid in the lymphatic system, as well as interstitial fluid, is

derived from blood plasma

Which layer of the heart is in contact with the blood?

endocardium

Which of the following is a true statement regarding strokes?

immmediate meidcal is crucial

An electrocardiogram is used to

measure the electrical activity of the heart

The left ventricle has a more muscular wall than the other three chambers of the heart because the left ventricle

must generate enough blood pressure to pump blood into the aorta and throughout the body

These structures serve as gates that regulate blood flow from arterioles into capillaries.

precapillary sphincters

After blood flows through the right atrium of the heart, its next major destination is the

right ventricle

Spontaneous contractions of the heart muscle begin in the

sinoatrial node