Blood Flow, Blood Vessels, Valves

The vessel layer that has a direct role in vasoconstriction is the __________.

• tunica intima

• tunica media

• tunica externa

• capillaries

Blood flows directly from __________ into capillary beds.

• heart

• aorta

• venules

• arterioles

The vessels that exhibit the lowest level of permeability are the __________.

• continuous capillaries

• fenestrated capillaries

• sinusoidal capillaries

When would the capillary beds surrounding the gastrointestinal organs be open?

• when digesting a meal

• while sleeping

• while exercising

• in between meals

Tags

NGSS.HS-LS1-3

Baroreceptors are effective in long-term regulation of blood pressure.

• False

• True

Tags

NGSS.HS-LS1-3

Which of the following is true when comparing arteries and veins?

• Arteries have valves; veins do not.

• Arteries are less muscular than veins.

• Arteries carry blood away from the heart; veins carry blood to the heart.

• At any given time, there is more blood present in arteries than in veins.

Blood flow would be increased by __________.

• increasing cardiac output

• decreasing vessel diameter

• increasing blood vessel length

• decreasing blood pressure

Hypertension is defined physiologically as a condition of sustained arterial pressure of __________ or higher.

• 120/80

• 140/90

• 130/90

• 130/80

Fluids would be likely to leave or filter out of the capillary if __________.

• net hydrostatic pressure (HP) is greater than net osmotic pressure (OP)

• net hydrostatic pressure (HP) is less than net osmotic pressure (OP)

• net filtration pressure (NFP) is negative

• osmotic pressure (OP) in the capillary is high

Cardiogenic shock is most likely to result from __________.

• large-scale blood loss

• a systemic allergic reaction

• multiple heart attacks

• a severe bacterial infection