Biology

Hematocrit is the percentage of red blood cells in the blood. In adult humans, hematocrit is roughly ...

Started by newyorker26

What is the most common cause of anemia?

Started by haleyc112

How long do human red blood cells circulate in the blood before they wear out and have to be replaced?

Started by karateprodigy

Which of the following cells are phagocytes?

Started by dbose

Which of the following statements about red blood cells is true?

Started by jrubin

The location of the heart's pacemaker is a specialized region of cardiac muscle called the

Started by ereecah

Using a stethoscope, you listen to a beating heart and hear "lub-dup, lub-dup." These sounds are created by

Started by AEWBW

During ventricular systole, the semilunar valves ________ and the AV valves ________.

Started by WWatsford

Cardiac output is defined as the volume of blood pumped by a(n) ________ each time it contracts.

Started by crazycityslicker

During which phase of the heartbeat do the ventricles fill with blood?

Started by anshika

The largest blood vessel in the human body is the

Started by LCritchfi

From the left ventricle, oxygen-rich blood flows through the

Started by tiara099

Blood is pumped from the heart to the lungs by the

Started by Collmarie

Oxygen-poor blood is carried from the heart of a mammal to the lungs via the

Started by sheilaspns

In mammals, which of the following vessels transports oxygenated blood from the lung back to the heart?

Started by burchfield96

In mammals, blood returning from the head will pass through the ________ just before entering the ...

Started by magmichele12

Which of the following statements about mammalian circulatory systems is false?

Started by naturalchemist

Although birds and mammals descended from different ancestors, they both have a four-chambered ...

Started by mydiamond

Which of the following animals has a three-chambered heart?

Started by skymedlock

Which of the following animals has a single circuit of blood flow and two heart chambers?

Started by acc299

Adaptation to terrestrial life involved major evolutionary changes. The change from gill breathing ...

Started by burton19126

You are dissecting a "mystery animal" in biology lab and discover that it has a series of closed ...

Started by Sufayan.ah

Which of the following is characteristic of the circulatory system of arthropods?

Started by jenna1

Which of the following is a function of the circulatory system?

Started by nelaaney

Which of the following statements regarding circulatory systems is true?

Started by B