43. Systole is contraction of the muscle. Diastole is relaxation of the muscle. 

24. THINK: Select the correct statement about oxygen transport in the blood.  

47. Which hormone is NOT produced by the placenta?    

1. The Pap smear is a test to detect cancerous changes in cells of the cervix.

44. Auricles are the flaplike appendages attached to the atria that provides a reserve capacity to increase the atrial volume. The atria are receiving chambers for blood returning to the heart from the pulmonary and systemic circulation.

48. If the AV node is not working correctly, a surgeon should surgically implant the heart with an artificial pacemaker.

45. The ___ is where sperm mature and are stored until needed.

49. Angina pectoris is thoracic pain caused by a fleeting deficiency in blood delivery to the myocardium, with resulting decreased oxygen being delivered to the cells. Because nitroglycerin acts as a vasodilator (similar to nitric oxide), blood flow is increased, promoting the delivery of oxygen to the cells

16. Which of the following is least involved in pulmonary circulation?        

45. Right atrium to left ventricle to pulmonary semilunar valve to pulmonary arteries to lungs to pulmonary veins (pulmonary circuit pump); left atrium to right ventricle to aorta to body tissues to venae cavae (systemic circuit pump).