skeletal system
How many bones are in the adult human skeleton?
206
The largest part of the brain, responsible for integration, is the _______.
cerebrum
The smallest unit of a muscle that contracts is the _______.
sarcomere
Which system is responsible for producing vitamin D and regulating body temperature?
integumentary system
which structure protects the brain
skull
Which skeleton division contains the vertebral column?
axial
What connects the two hemispheres of the brain?
corpus callosum
Sarcomeres are made of _______.
myofilaments
Which body system makes blood cells and stores calcium?
skeletal system
What percentage of blood volume is plasma?
55%
The patella is classified as what type of bone?
sesamoid
Which lobe controls executive functions and decision-making?
frontal lobe
The two types of myofilaments are _______ and _______.
actin and myosin
Which system carries electrical signals to control thoughts and responses?
nervous system
Which group is “not true cells” because they lack nuclei and organelles?
erythrocytes
Which function of bone involves red marrow?
blood cell formation
Which part of the brain regulates heart rate and respiration?
medulla oblongata
Which protein blocks myosin-binding sites on actin when the muscle is relaxed?
tropomyosin
Which system transports oxygen, nutrients, and waste throughout the body?
cardiovascular system
The hematocrit is defined as what?
he percentage of blood made up by erythrocytes
Which mineral is primarily stored in bones?
calcium
Approximately how many multipolar neurons make up the human brain?
86 billion
What happens when calcium binds to troponin?
tropomyosin is pulled off actin binding sites
Which system prevents infection and returns excess tissue fluid to the bloodstream?
immune/lymphatic system
what type of tissue is blood?
connective