The tubules of the testis in which sperm are manufactured.
Seminal Vesicle
One of the two glands located on the posterior surface of the pladder; the two glands contribute about 60% of the fluid in the semen.
Selectively Permeable
The cell membrane that is impermeable to one substance by freely allows another to pass through.
Segmentation
Dividing into smaller sections; a special type of movement in the gut.
Secretory Phase
Menstrual phase in which there is corpus luteum development; the progestational or luteal phase.
Second-Class Lever
A lever system in which the resistance is in the enter and the effort and fulcrum are on either side.
Second Heart Sound
The sound heard when the semilunar valves close.
Sebum
Oily secretion(a mixture of lipids, proteins and electrolytes) secreted by sebaceous glands in the skin; provides lubrication and protects the keratin of the hair, conditions the skin and prevents excess evaporation of water.