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The largest vein in the human body is the inferior vena cava, which carries deoxygenated blood from the lower half of the body back up to the heart.

The heart of an amphibian, such as a frog, has three chambers, one ventricle and two atria. Blood from the ventricle travels to the lungs and skin where it is oxygenated and also to the body.

The medulla oblongata, also known as the medulla, directly controls certain ANS responses, such as heart rate, breathing, blood vessel dilation, digestion, sneezing, swallowing and vomiting.
The medulla oblongata controls involuntary actions.
The medulla oblongata is the part of the brain closest to the spinal cord.

The SA node is the heart’s natural pacemaker.
The SA node consists of a cluster of cells that are situated in the upper part of the wall of the right atrium (the right upper chamber of the heart).
The electrical impulses are generated there.

Muscle is a soft tissue, one of the four basic types of animal tissue.
Muscle tissue gives skeletal muscles the ability to contract.
Muscle is formed during embryonic development, in a process known as myogenesis.
Muscle tissue contains special contractile proteins called actin and myosin which interact to cause movement.

The lungs have no skeletal muscles of their own. The work of breathing is done by the diaphragm, the muscles between the ribs (intercostal muscles), the muscles in the neck, and the abdominal muscles.

The sartorius muscle is the longest muscle in the human body. It is a long, thin, superficial muscle that runs down the length of the thigh in the anterior compartment.
Largest muscle- Gluteus maximus– Buttocks region.
Smallest muscle- Stapedius.
Strongest muscle- Masseter.

Smooth muscle generally forms the supporting tissue of blood vessels and hollow internal organs, such as the stomach, intestine, and bladder. It is considered smooth because it does not have the microscopic lines (the striations) seen in the other two types of muscle.

Cardiac muscle is involuntary, striated muscle that is found in the walls and histological foundation of the heart, specifically the myocardium.
Cardiac muscle is one of three major types of muscle, the others being skeletal and smooth muscle.
Cardiac muscle cells are located in the walls of the heart, appear striped (striated), and are under involuntary control.

The p orbital is a dumbbell shape.
Because the electron is pushed out twice during the rotation to the 3p subshell when an opposite-spin proton aligns gluons with two same-spin protons.

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