Which of the following statements about mature red blood cells is not true?

• Life span of around 120 days

• No nuclei

• Contain hemoglobin

• Divide to make new cells when old ones need to be replaced

If your blood type is O- that means

• you have no agglutinogens on your red blood cells.

• you have the rhesus antigens.

• you only have anti-A antibodies in your blood plasma.

• all of the above.

Which ion allows hemoglobin to readily bind with oxygen?

• Fe2+

• Na+

• K+

• Ca2+

The ______ side of the heart is the ______ circuit and pumps oxygen-poor blood to the ________.

• right; systemic; lungs

• right; pulmonary; lungs

• left; systemic; body

• left; pulmonary; body

The ______ side of the heart is the ______ circuit and pumps oxygen-rich blood to the ________.

• right; systemic; lungs

• right; pulmonary; lungs

• left; systemic; body

• left; pulmonary; body

The purpose of the serous fluid in the pericardial cavity is

• to carry critical nutrients like oxygen to the heart.

• to provide Ca2+ ions needed for muscle contraction.

• to decrease friction between the layers of the heart as it contracts.

• to lubricate the walls of the blood vessels to decrease resistance to blood flow.

Which of the following accurately reflects the order of events that causes the heart to pump out blood?

• Electrical event → distribution → mechanical event → pressure change → fluid movement

• Electrical event → pressure change → mechanical event → distribution → fluid movement

• Mechanical event → distribution → electrical event → pressure change → fluid movement

• Mechanical event → pressure change → electrical event → distribution → fluid movement

Which of the following is true for both cardiac and skeletal muscle tissues?

• Striated

• Branched

• Contract as a unit

• Can spontaneously depolarize without input from the nervous system

Which of the following statements about AEDs is false?

• They are tools used for someone experiencing sudden cardiac arrest.

• An AED can be used to restart a heart with no electrical activity.

• They get the cardiac cells contracting in sync again.

• They work by stopping the heart for a second in order to reset it.

Which statement below correctly matches the structure with its function?

• Veins carry blood away from the heart.

• The atria are the high pressure receiving chambers of the heart.

• The sinoatrial node initiates the action potential that causes the heart to beat.

• Contractile cardiac muscle cells can trigger their own action potentials without neural input.