Tissues, Part 1: Crash Course Anatomy & Physiology #2

In this episode of Crash Course Anatomy & Physiology, Hank gives you a brief history of histology and introduces you to the different types and functions of your body's tissues.

Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App!

Chapters:
Introduction 00:00
Nervous, Muscle, Epithelial & Connective Tissues 1:23
History of Histology 2:07
Nervous Tissue Forms the Nervous System 5:17
Muscle Tissue Facilitates All Your Movements 7:00
Identifying Samples 9:03
Review 9:48
Credits 10:22

Want to find Crash Course elsewhere on the internet?

[crashcourse]

Pssst... we made flashcards to help you review the content in this episode! Find them on the free Crash Course App!

[victoriameconi]

In case anyone needs notes for this:
Homeostasis: Balance of materials and energy used to keep an individual alive
Maintained through cells
Organs: when two or more tissues combine
Tissue: the fabric of the body
Tissue means woven
Type of tissue will define the function of the tissue
Four primary tissue types
Nervous tissue: Control and communication
Muscle tissues: Allow movement
Epithelial tissues: Cover and protect the body
Connective tissues: Provide support to the body
Histology: The study of tissue
Carmine: A red dye derived from the scaled of crushed up insects used to stain tissue to find different types of cell structure
Nervous tissue: forms central nervous system and nerves for the peripheral nervous system, functions to sense stimuli and send electrical impulses through the body
Neurons: Specialized building blocks of the nervous system, function to generate and conduct the electrochemical nerve impulses (i.e. think, dreaming, eating, etc)
Glial cells: Provide support, insulation, protection, and fuses to blood vessels
Nervous tissue is composed of:
Cell bod/(soma): Neuron’s life support
Nucleus
Mitochondria
DNA
Dendrites: Collect signals from other cells and send signals back to the cell body/(soma)
Axon: carries messages to other neurons, muscles, and glands
Nervous system: Composed of the brain and spinal cord of the central nervous system, function to regulate and control the body’s functions
Peripheral nervous system: Nerves, function to regulate and control the body’s functions
Muscle tissues: Contract and move
Three types of muscle tissues:
Skeletal muscle tissue: long multinucleate parallel cells containing striations, attaches bone to muscle and supports body but functions to make the body move. Moves voluntary.
Location: Throughout the body
Multinucleate: Long, cylindrical cells
Striations: Fine black lines running perpendicular to the fibers
In short: long straight cells, striations, multiple nuclei
Cardiac muscle tissue: cells divide and converge, one nucleus per cell, striated, with intercalated disks, works involuntarily, functions to propel blood through the circulatory system
Location: In the heart
Unlike skeletal muscle their cells are uninucleate meaning there is only one nucleus
Intercalated disks: hold muscle cells together during contraction and contain pores for electrical and chemical signals to pass-through one cell to the next
In short: Striated, one nucleus, branching structure
Smooth muscle tissue: Short tapered cells, but no striations. Moves involuntary. Function to squeeze substances through a contraction.
Location: blood vessels and hollow organs in the digestive and urinary tracts as well as the uterus
The difference from the other two muscle tissues: No striations
In short: Uninucleate, packed together, no striations

[adelsarhan]

I’ve left my trade of 10 years to start university again, I was a plumber. I’m 29 now.

I’m embarking on a 7 year journey to become a doctor of medicine. I will be starting my first trimester in 3 weeks, thanks for sharing the knowledge in such an easy way.

[merzymaiya]

atom= letter
cell= word
tissue= sentence
organ= paragraph
organ system= page
body= book

[sophiaann]

I wish I was an amoeba. People wouldn't expect me to socialize or have a job or get an education.

[TheGeekyAsianBoy]

Only CrashCourse can make an amoeba cute.

[JamesRoyceDawson]

so, I want a plushy of that amoeba from the beginning now. 

[dudersmart]

I love the crash course videos, hardly ever paid attention at school, and now in my mid thirties i have decided to learn about a lot of things I knew nothing about. Brilliantly delivered, genuinley engaging and interesting, you guys should be proud of these,
thankyou so much for putting all of these up!

[Repzion]

How does he speak so fluently? I love how he speaks, does he have a script? 

[shaleighmaxwell]

Thank you so much Chrash Course! I am a pre-nursing major and I just started my A&P course. I'm going to tell all my classmates about this. And thanks for helping me get through Bio 103 in the fall. I made the Deans List.

[Tiff]

your videos are helping me pass A&P.. thank you..you are the modern day Bill Nye💚💚

[epistax]

For me, I'd love more quizzes throughout all of these Crash Course series. I'm well done with my formal education and sometimes after I watch these videos I find myself wondering if I actually learned something. 

[Dylan-hxoo]

As a First Year Nursing student in the PH, this kind of video is God sent for students who's studying A&P...
Thanks CC!

[suluzah]

I really appreciate these subtitles. A) it makes it a lot easier to watch in class and B) is very helpful when my Spanish-speaking grandmother asks what I'm watching

[theskerdav]

sat here waiting for 3 hours for this. YAS

[KaydenF]

I love how chill he is when he is talking about the amoeba. Like "Yo dude, check out this Pretty cool"

[AlexTheMary]

Omg that nerve cell at 5:40 is freaking adorable!

[Spectrumability]

The thing about organs that fascinates me (as a paraplegic) is how some functions are autonomic and others are not. I call them "no-brainers" because they act without the brain saying anything. For example, even though I don't have feeling of much of my lower body, my kidneys still function, my intestines still do their thing, etc.

The human body never ceases to intrigue me. Thank you for letting everyone know about how fascinating we all are. :)

[bobhope]

This video was not very informative, I watched this whole episode and I still can't tell the difference between store brand and kleenex tissues, I hope you cover those tissues in part 2.

[jameswhyte]

do a crashcourse on physics! That would be amazing!