The students were warned: Prepare for dizziness and extreme squeamishness.
But the students from two area high schools stayed glued to their chairs in a training room at Beth Israel Deaconess Medical Center.
Projected on a large screen at the head of the class was the ivory neck of a 70-year-old patient identified only as Jane Doe. Surgeon Peter Mowschenson then brought out his scalpel and made an incision.
The students gasped. Some covered their mouths. Others clutched their classmates. Nobody left.
“I was grossed out,’’ confessed Alicia Forde, a 17-year-old Madison Park High School junior, after the thyroidectomy. “But then I started to get used to it.’’
Many students learn about the sciences with their eyes half shut, fighting to stay awake as their teachers speak at the blackboard. But Forde and more than 40 students from Madison Park and Brookline high schools saw their lesson on the endocrine system come to life yesterday as the surgeon removed the left lobe of the patient’s thyroid gland, which was possibly cancerous.
The students are part of a high school program that immerses them in the fast-paced medical environments of Beth Israel Deaconess, Brigham and Women’s Hospital, and Harvard Medical School. In addition to health classes at their high schools, the students spend one hour a week at the medical school’s Gilbert Simulation Laboratory, where they work on simulated cases, from accidents to diseases.
The program began as a one-week summer initiative at the Gilbert laboratory. Last year, Julie Joyal Mowschenson helped expand it to a full course at Brookline High School, where she teaches science. This year, she got Madison Park Technical and Vocational High School in Roxbury to sign up.
Officials hope the program will be expanded to Cambridge Rindge and Latin School next year and - ultimately - nationwide.
Julie Joyal Mowschenson, whose husband performed yesterday’s thyroidectomy, said her aim is to make science exciting for students who might not otherwise like it or excel in it.
“This is really a national issue,’’ said Mowschenson, who is a registered nurse. “We are not keeping up with how we are teaching science to kids. . . . We need an innovative approach.’’
Nancy E. Oriol, dean of students at Harvard Medical School, said the hands-on program allows the teens to build critical thinking and problem-solving skills while teaching them about human anatomy in an unconventional manner.
This “allows young students to actually . . . see how science is alive in the human body,’’ she said. “Students this age are very interested in how their bodies work.’’
State Education Secretary Paul Reville, who was at the viewing, hailed the effort as ground breaking, saying that more efforts should be taken to engage young people in the field of science.
“I witnessed an extraordinary experience of the power of experimental education,’’ Reville said. “This is what we need to engage students . . . to build an interest in the [health] careers.’’
In the training room at the Carl J. Shapiro Clinical Center yesterday, the students got a quick review of the endocrine system - a series of glands that regulate such things as metabolism, development and growth, and tissue function.
Then the movie screen was pulled down, showing an operating room upstairs and a medical team preparing for surgery. The camera zoomed in on Jane Doe’s neck; otherwise, the only images visible on screen were the team’s hands and their instruments.
As Dr. Mowschenson and his team worked, he narrated his every move.
The students peppered him with questions, from whether anesthetized patients ever wake up during surgery to how he managed such a procedure with minimal blood.
“It takes a lot of practice,’’ Dr. Mowschenson responded.
The procedure lasted a little more than 30 minutes, to the amazement of students.
The patient’s thyroid gland looked like a chunk of sausage. Using instruments to hold it in place, Mowschenson severed the remaining tissues around it and removed it. The students cheered.
“I was kind of surprised that there wasn’t a lot of blood,’’ Andrew Silva, a junior at Brookline High School, said. “You kind of figure, especially when you cut into the neck, that you are going to bleed. But this was very minimal.’’
Silva said the only surgery he has seen has been on television, so yesterday’s experience was pretty cool.
“I wouldn’t call it shock and awe because it wasn’t that extreme,’’ he added, “but I’d say I was in rapture.’’
When the surgery began yesterday, Leila Dasilya covered her mouth with her hand and left it there - afraid to scream.
“I don’t know why I was so scared,’’ she said.
Forde said she, too, looked away at certain points during the procedure, but was glad she was there.
“I always wanted to see a surgery,’’ she said. “Today, I got to see one.’’
Meghan E. Irons can be reached at mirons@globe.com. 
© Copyright 2009 Globe Newspaper Company.