Bones, Muscles and Skin

Science

An involuntary muscle found only in the heart

Cardiac muscle

An involuntary muscle found only in the heart. Cardiac muscle is a special type of muscle that makes the heart pump blood without us having to think about it.

A strong, flexible connective tissue found in skeletons

Cartilage

A strong, flexible connective tissue found in skeletons. Cartilage is a smooth tissue that cushions and supports joints in the body.

The hard outer layer of a bone

Compact bone

The hard outer layer of a bone. Compact bone. It is the dense, strong part of the bone that provides support and protection.

The second layer of skin that contains blood vessels, nerves, sweat glands, and hair follicles

Dermis

The second layer of skin that contains blood vessels, nerves, sweat glands, and hair follicles. Dermis. The dermis is the skin layer that supports and nourishes the outer layer while housing important structures like hair follicles and sweat glands.

The glands and hormones that regulate body conditions and growth, like the thyroid

Endocrine system

The glands and hormones that regulate body conditions and growth, like the thyroid. Endocrine system. The endocrine system is a network of glands that produce hormones to control many important body functions.

The system, including the skin, that separates the body from the outside environment

Integumentary system

The system, including the skin, that separates the body from the outside environment. Integumentary system. The integumentary system is the body's first line of defense, protecting it from harm and helping regulate temperature.

A muscle that is not under conscious control, like the heart muscle

Involuntary muscle

A muscle that is not under conscious control, like the heart muscle. Involuntary muscle. Involuntary muscles are muscles that work automatically without you thinking about them, like the heart pumping blood.

A point where two or more bones meet

Joint

A point where two or more bones meet. Joint. In Science, a joint is where bones connect in the body, allowing for movement and flexibility.

A tough band of tissue that holds bones together at a joint

Ligament

A tough band of tissue that holds bones together at a joint. Ligament. Ligaments are strong, flexible tissues that connect bones at joints, helping to stabilize and support movement.

The ratio of the output force to the input force in a machine

Mechanical advantage

The ratio of the output force to the input force in a machine is the mechanical advantage. It tells you how much a machine can multiply your effort to make tasks easier.

The organ system made up of muscles that help the body move

Muscular system

The organ system made up of muscles that help the body move. Muscular system. The muscular system is a network of muscles working together to produce movement in the body.

A muscle that is attached to the skeleton

Skeletal muscle

A muscle that is attached to the skeleton. Skeletal muscle. Skeletal muscle is a type of muscle that helps move bones and is under our control.

All the bones in the body that support it, help it to move, and protect internal organs

Skeletal system

All the bones in the body that support it, help it to move, and protect internal organs. Skeletal system. The skeletal system is the framework of bones that supports the body, allows movement, and protects organs.

The outer, thinnest layer of skin that is made up of dead cells

Skin epidermis

The outer, thinnest layer of skin that is made up of dead cells. Skin epidermis. The epidermis is the top layer of your skin that protects your body by creating a barrier to the outside environment.

An involuntary muscle that controls internal organs like the stomach and intestines

Smooth muscle

An involuntary muscle that controls internal organs like the stomach and intestines. Smooth muscle. Smooth muscle is a type of muscle that works automatically to manage movements in internal organs without conscious control.

A tough band of tissue that attaches bones to muscles

Tendon

A tough band of tissue that attaches bones to muscles. Tendon. Tendons are strong cords that connect muscles to bones to help move our body parts.

One of the 33 bones that make up the backbone

Vertebrae

One of the 33 bones that make up the backbone. Vertebrae. Vertebrae are the individual bones that stack to form your spine, supporting your body and protecting the spinal cord.

A muscle that is under conscious control, like the arm or leg muscles

Voluntary muscle

A muscle that is under conscious control, like the arm or leg muscles. Voluntary muscle. Voluntary muscle is a type of muscle that you can control at will, like when you decide to move your arms or legs.