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Cell fragments that participate in blood clotting are called ________.

The serous membrane that covers the lungs is the visceral ________.

The process of sperm production within the seminiferous tubules is called ________.

The double-layered sac that encloses the heart and anchors it in the thorax is the ________.

The initial step in hemostasis in which blood vessels constrict is called vascular ________.

The hormone that increases blood calcium levels by stimulating osteoclasts is ________ hormone.

The pacemaker region of the heart that normally sets the sinus rhythm is the ________ node.

The process of sperm production within the seminiferous tubules is called ________.

The pacemaker region of the heart that normally sets the sinus rhythm is the ________ node.

Chemical messengers that act on the same cell that secreted them are called ________ signals.