« previous next »
« previous next »
 

Did you know?

Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.

Did you know?

During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).

Did you know?

Medication errors are three times higher among children and infants than with adults.

Did you know?

The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.

Did you know?

The top 10 most important tips that will help you grow old gracefully include (1) quit smoking, (2) keep your weight down, (3) take supplements, (4) skip a meal each day or fast 1 day per week, (5) get a pet, (6) get medical help for chronic pain, (7) walk regularly, (8) reduce arguments, (9) put live plants in your living space, and (10) do some weight training.

An artificial vagina, used to collect horse semen An artificial vagina, used to collect horse semen
The stages of labor and delivery. (A) During the dilation stage the cervix thins and dilates to 10 c The stages of labor and delivery. (A) During the dilation stage the cervix thins and dilates to 10 c
Mechanisms of Penile Erection and Basis for Pharmacological Treatment of Erectile Dysfunction Mechanisms of Penile Erection and Basis for Pharmacological Treatment of Erectile Dysfunction
(A) Dilation stage: uterine contractions cause dilation of the cervix; (B) expulsion stage: birth, ... (A) Dilation stage: uterine contractions cause dilation of the cervix; (B) expulsion stage: birth, ...
Male Reproductive System - Semen Male Reproductive System - Semen
Male Reproductive System - Semen Male Reproductive System - Semen
Video: Cardiac Cycle (Part 2 of 4)

For a complete list of videos, visit our video library