AP Biology - Thermoregulation, Endocrine System, Sensory System
Videos and experiments that are suitable for Biology. Thermoregulation, Osmoregulation, Endocrine System and Hormones, Reproductive System, Nervous System and The Sensory System.
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Thermoregulation
This video explains how organisms are able to regulate their internal body temperature (or not). It starts with a brief description conduction, convection, radiation and metabolism. It contrasts ectotherms and endotherms. It also explains how endotherms use negative feedback loops to regulate internal body temperature.
Osmoregulation
This video explains how organisms regulate their internal osmolarity or not. It starts with a brief description of osmosis and why it is important for animal cell to be surrounded by an isotonic solution. It then explains how freshwater and saltwater fish osmoregulate. It finally discussed the nephron within the kidney as an osmoregulatory organ. It explains how the loop of Henle sets up a gradient which is used to reclaim or remove water with the use of the antidiuretic hormone (or ADH).
Endocrine System and Hormones
This video explains the major elements in the endocrine system. It explains how glands produce hormones which target cells. It differentiates between water soluble and lipid soluble hormones. It then describes the hormones and actions of ten glands; pineal, anterior pituitary, posterior pituitary, thyroid, parathyroid, pancreas, adrenal cortex, adrenal medulla, testes and ovaries.
Reproductive System
This video starts with a brief description of asexual and sexual reproduction. It explains how meiosis ensures variation in the next generation. It describes the important structures in the male and female reproductive system. It explains how the menstrual cycle ensure the success of the released ovum. It also shows how a zygote becomes a blastula, gastrula, embryo and fetus.
Nervous System
This video begins with a discussion of brain lateralization and gives a brief demonstration of tests that were performed on split-brain individuals. It then discusses the major parts of a neuron and explains how action potentials are generated using voltage-gated ion channels. It explains how neurotransmitters transmit messages across a synapse and how these messages can be either inhibitory or excitatory.
The Sensory System
This video explains how we perceive our environment using our sensory system. It starts with a brief discussion of action potentials and the nervous system. It shows that we many more than five senses. It goes into more detail to show how humans smell, see and hear.
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