In this lesson our instructor talks about the respiratory system. First she discusses gas exchange in animals, aquatic animals, and terrestrial animals. Then she talks about the human respiratory system and ventilation. Four complete example videos round up this lesson.
Respiration is the process
through which gas exchange occurs. During respiration, animals take
in oxygen and release carbon dioxide.
Gas exchange in simple aquatic
animals occurs via diffusion across the whole surface of the body.
In more complex aquatic animals, gills provide a surface across
which gas exchange can occur.
Some animals rely on diffusion
across the skin for gas exchange. More complex animals have internal
respiratory surfaces that include branched tubes or folded
In insects, air enters the body
through small openings called spiracles. Air then passes into air
ducts called tracheae, which branch into tracheoles that reach the
cells of the body so that gas exchange can occur.
In mammals, air enters the
nasal cavity, passes through the pharynx and larynx and then into
the trachea. Next, the air enters the bronchi, which branch into
bronchioles, ending in alveoli, the site of gas exchange.
Ventilation occurs during the
process of breathing. During inspiration, air is pulled into the
lungs by the negative pressure created when the thoracic cavity
expands. The reverse process occurs during expiration.
The Respiratory System
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.