Explanation

The 4×100 meter relay was first introduced at the 1912 Stockholm (Sweden) Olympics for men.

It became a standard Olympic track event from that year onward.

Explanation

Venus is the hottest planet in the solar system.

Venus has no moons.

The "black planet" is Venus.

The second closest planet to the sun is Venus.

The slowest-rotating planet is Venus.

Venus is similar in size to Earth.

Additional information:

Eight planets in the solar system: 

1. Mercury
2. Venus
3. Earth
4. Mars
5. Jupiter
6. Saturn
7. Uranus
8. Neptune

Explanation

An odometer measures the total distance a vehicle has traveled.

It is usually located on the dashboard near the speedometer.

Explanation

The cell membrane of cardiac muscle cells maintains an electrochemical gradient of sodium (Na⁺), potassium (K⁺), and calcium (Ca²⁺) ions.

These ions are crucial for generating and transmitting electrical impulses that cause heart contractions.

Explanation

In Kabaddi, the distance between the two posts (called Palas) is 20 feet in standard men's matches.

These posts mark the ends of the court and help define the playing area.

Explanation

During swimming, knees and ankles play a key role in kicking movements.

These joints allow flexion and extension, providing thrust in the water.

Explanation

Heart muscle (cardiac muscle) contracts automatically without conscious control — it's involuntary.

Neck and leg muscles are voluntary and controlled by conscious effort.

Explanation

Muscular endurance is the ability of muscles to perform repeated actions over a long period without fatigue.

It is essential for activities like running, swimming, and cycling.

Explanation

The galactic bulge is the dense, bright central region of a spiral galaxy, including our Milky Way.

It contains older stars and a supermassive black hole at its core.

Explanation

One human leg has 31 bones including the femur, tibia, fibula, patella, tarsals, metatarsals, and phalanges.

These bones support movement and bear the body’s weight.