BIOS-252 Anatomy & Physiology II with Lab

Exam 1 – Biology 252

what vessel receives blood during right ventricular systole?

- pulmonary trunk

Opening and closing of the heart valves is caused by ___________ _________

- pressure gradients

what directly stems from the ascending aorta before it branches into the circumflex branch and

anterior interventricular branch?

- Left coronary artery

Obstruction of the ___________ will cause a more severe myocardial infarction (MI) than the

obstruction of any of the others.

- left coronary artery

what feature is shared by cardiac muscle and skeletal muscle

- muscle fiber striation

electrical signals pass between cardiomyocytes through the _____________ _____________

- gap junctions

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The ___________ __________ is the pacemaker that initiates each heart beat

- sinoatrial node

Any abnormal cardiac rhythm is called a ____________

- Arrythmia

what are normal heart sounds caused by?

- closure of the heart valves

When does atrial systole begin?

- immediately after the P wave

The tricuspid valve is closed when the ventricle is in ______________

- systole

The second heart sound is heard at the start of which phase of the cardiac cycle?

- isovolumetric relaxation

The volume of blood ejected by each ventricle in one minute is called the ____________

__________

- cardiac output

Hypertension is commonly considered to be a chronic resting blood pressure higher than

__________.

- 140/90

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