Which organ is primarily responsible for pumping blood throughout the human body?

• Liver

• Heart

• Lungs

• Kidney

What is the main function of red blood cells in the circulatory system?

• Fighting infections

• Carrying oxygen

• Producing hormones

• Filtering waste

Which enzyme begins the breakdown of starches in the mouth during digestion?

• Pepsin

• Amylase

• Lipase

• Lactase

Tags

NGSS.MS-LS1-7

Which part of the digestive system is primarily responsible for nutrient absorption?

• Stomach

• Small intestine

• Large intestine

• Esophagus

What is the basic functional unit of the nervous system?

• Neuron

• Glial cell

• Axon

• Dendrite

Which part of the brain controls voluntary muscle movements?

• Cerebellum

• Medulla oblongata

• Cerebrum

• Hypothalamus

What is the primary muscle involved in the process of inhalation?

• Biceps

• Diaphragm

• Trapezius

• Deltoid

Which structure in the respiratory system is the site of gas exchange?

• Trachea

• Bronchi

• Alveoli

• Larynx

What type of tissue connects muscles to bones?

• Ligament

• Tendon

• Cartilage

• Adipose

Which mineral is most important for bone strength in the musculoskeletal system?

• Iron

• Calcium

• Potassium

• Sodium