Anatomy & Physiology II 

In the ________, the first 14 days is called the _ phase.

________ is necessary to maintain a pregnancy, it stimulates the uterus to keep secreting substances to help maintain fetus.

A) Polyspermy is common and will usually result in twins B) The first sperm cell that reaches the egg will penetrate the corona radiata of the egg C) Fusion of a sperm cell with an oocyte occurs as soon as the sperm cell reaches the egg ________ D) ________ Enzymes on the surface of the sperm cell head help penetrate the corona radiata of the egg.

________ are muscular tubes that undergo peristalsis to propel urine toward the urinary bladder.

A) Regulates ________ and produces hormones % % B) % % Formation of feces C) Helps maintain homeostasis by controlling the composition and pressure of blood D) Discharge of wastes to the external environment.

In active transport, ________ describes a single membrane protein that transports two molecules in opposite directions.