In this lesson our instructor talks about the musculoskeletal system. First she discusses the skeletal system types and function. Then she talks about skeletal system components, skeletal muscle, the sliding filament theory, and the neuromuscular junction. She lectures on the smooth muscle, the cardiac muscle and a summary of muscle types. Four complete example videos round up this lesson.
The skeletal system functions
in support, protection and mobility. An exoskeleton is located
outside of the body, while an endoskeleton is located on the inside
of the body.
Bone is a type of connective
tissue. It is mineralized, which accounts for its strength.
Cartilage is also connective tissue but is more flexible than bone.
Skeletal muscle cells are large
and multinucleated. Skeletal muscle is striated due to the regular
arrangement of actin and myosin within muscle fibers.
The contractile unit of
skeletal muscle is the sarcomere.
According to the sliding
filament theory, during muscle contraction the thick and thin
filaments slide past one another, causing the sarcomere to shorten.
Smooth muscle is under
involuntary control. It lacks striations and unlike skeletal muscle,
the cells have only one nucleus each.
The heart is composed of
cardiac muscle. Cardiac muscle is striated and is inherently
Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.
The book and CD package include three full length practice exams that are presented with all questions answered and explained. The author also presents detailed reviews of all test topics and includes multiple-choice and free-response questions with answers at the end of each topic's chapter.
This book has a great topic-by topic breakdown of the 14 must-know principles with sample questions and answers for each of the subjects. Laboratory Review includes a focused review of all 12 AP laboratory exercises. Included in this is 2 full length practice tests that stimulate the actual test along with answers and complete explanations.
This book includes a comprehensive biology test topic review, covering everything from photosynthesis to genetics to evolution. Cracking the AP Biology also includes testing strategies for the grid-in and essay section, great guidance on writing a high-scoring essay, and two full length practice exams with detailed explanations.