BIOL 335: Invertebrate Zoology

Discover the mechanics of voltage-gated Na+ channels and their role in neuron activity. This video breaks down key neuronal terms like resting potential and threshold to explain precisely when these channels open. You'll come away understanding that voltage-gated Na+ channels open at the threshold state initiating an action potential.

Explore the secrets of fossilization in sedimentary rocks. Uncover how these rocks, like nature's archives, preserve the history of life on Earth over billions of years. Delve into the unique processes that create these historical records.

Discover the relationship between the papillary layer of the dermis and the layers of the epidermis. Understand the structure, function, and connections that exist in our skin's anatomy.

Explore the fascinating world of vertebrates and tunicates in this video answer. Learn about their shared anatomical features including notochords and dorsal hollow nerve cords that reveal their closely linked evolutionary history

Explore the key concepts that might illustrate the unity among all organisms including emergent properties descent with modification and natural selection. Understand why the structure and function of DNA ultimately stand as the best example of this unity

Understand the anatomical significance and position of the lumbar region within the spinal structure. This video explains how the lumbar region which constitutes the lower back interacts with other areas like the popliteal and umbilical regions. Gain a clear perspective on its role in supporting body weight and its location relative to other spinal sections