In this lesson our instructor talks about the excretory system. First she discusses nitrogenous wastes, osmoregulation, and types of excretory systems. Then she talks about the human excretory system, filtration, reabsorption, and secretion. Lastly, she lectures on the nephron, antiduretic hormone, and aldoterone. Four complete example videos round up this lesson
The excretory system is
responsible for the removal of nitrogenous wastes and for
The functional unit of the
kidney is the nephron. Filtration takes place in the glomerulus
where pressure drives water small molecules across the glomerular
Reabsorption of water and
substances such as NaCl, amino acids and glucose takes place in in
the proximal convoluted tubule. Other substances are secreted into
Aquaporins in the descending
loop of Henle allow for water reabsorption in this segment of the
The ascending loop of Henle is
impermeable to water. The ascending loop of Henle maintains the
concentration gradient from cortex to medulla by transporting NaCl
into the interstitium.
In the distal convoluted tubule
both reabsorption and secretion take place.
The collecting duct is
permeable to water when acted upon by antidiuretic hormone (ADH).
ADH stimulates the reabsorption of water by the kidney.
Aldosterone is released in
response to low blood pressure or blood volume and stimulates the
reabsorption of Na+ by the distal convoluted tubule.
The Excretory 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.